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    <section id='main' class="content source"><pre class="line-numbers"><span id="1">   1</span>
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</pre><pre class='rust '>
<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>

<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>borrow</span>::<span class='ident'>Cow</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>HashMap</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>hash_map</span>::<span class='ident'>Iter</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>&quot;pattern&quot;</span>)]</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>::<span class='ident'>pattern</span>::{<span class='ident'>Pattern</span>, <span class='ident'>Searcher</span>, <span class='ident'>SearchStep</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>::<span class='ident'>FromStr</span>;

<span class='kw'>use</span> <span class='ident'>program</span>::{<span class='ident'>Program</span>, <span class='ident'>MatchEngine</span>};
<span class='kw'>use</span> <span class='ident'>syntax</span>;

<span class='kw'>const</span> <span class='ident'>REPLACE_EXPAND</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='string'>r&quot;(?x)
  (?P&lt;before&gt;^|\b|[^$]) # Ignore `$$name`.
  \$
  (?P&lt;name&gt; # Match the actual capture name. Can be...
    [0-9]+  # A sequence of digits (for indexed captures), or...
    |
    [_a-zA-Z][_0-9a-zA-Z]* # A name for named captures.
  )
&quot;</span>;

<span class='doccomment'>/// Type alias for representing capture indices.</span>
<span class='kw'>pub</span> <span class='kw'>type</span> <span class='ident'>CaptureIdxs</span> <span class='op'>=</span> [<span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>];

<span class='doccomment'>/// Escapes all regular expression meta characters in `text`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The string returned may be safely used as a literal in a regular</span>
<span class='doccomment'>/// expression.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>quote</span>(<span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>quoted</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>());
    <span class='kw'>for</span> <span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>text</span>.<span class='ident'>chars</span>() {
        <span class='kw'>if</span> <span class='ident'>syntax</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) {
            <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='string'>&#39;\\&#39;</span>)
        }
        <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='ident'>c</span>);
    }
    <span class='ident'>quoted</span>
}

<span class='doccomment'>/// Tests if the given regular expression matches somewhere in the text given.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If there was a problem compiling the regular expression, an error is</span>
<span class='doccomment'>/// returned.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// To find submatches, split or replace text, you&#39;ll need to compile an</span>
<span class='doccomment'>/// expression first.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_match</span>(<span class='ident'>regex</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
    <span class='ident'>Regex</span>::<span class='ident'>new</span>(<span class='ident'>regex</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>r</span><span class='op'>|</span> <span class='ident'>r</span>.<span class='ident'>is_match</span>(<span class='ident'>text</span>))
}

<span class='doccomment'>/// An error that occurred during parsing or compiling a regular expression.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Error</span> {
    <span class='doccomment'>/// A syntax error.</span>
    <span class='ident'>Syntax</span>(<span class='ident'>syntax</span>::<span class='ident'>Error</span>),
    <span class='doccomment'>/// The compiled program exceeded the set size limit.</span>
    <span class='doccomment'>/// The argument is the size limit imposed.</span>
    <span class='ident'>CompiledTooBig</span>(<span class='ident'>usize</span>),
    <span class='doccomment'>/// Hints that destructuring should not be exhaustive.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// This enum may grow additional variants, so this makes sure clients</span>
    <span class='doccomment'>/// don&#39;t count on exhaustive matching. (Otherwise, adding a new variant</span>
    <span class='doccomment'>/// could break existing code.)</span>
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='ident'>__Nonexhaustive</span>,
}

<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
    <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Error</span>::<span class='ident'>Syntax</span>(<span class='kw-2'>ref</span> <span class='ident'>err</span>) <span class='op'>=&gt;</span> <span class='ident'>err</span>.<span class='ident'>description</span>(),
            <span class='ident'>Error</span>::<span class='ident'>CompiledTooBig</span>(_) <span class='op'>=&gt;</span> <span class='string'>&quot;compiled program too big&quot;</span>,
            <span class='ident'>Error</span>::<span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
        }
    }

    <span class='kw'>fn</span> <span class='ident'>cause</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span>::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Error</span>::<span class='ident'>Syntax</span>(<span class='kw-2'>ref</span> <span class='ident'>err</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>err</span>),
            _ <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Error</span>::<span class='ident'>Syntax</span>(<span class='kw-2'>ref</span> <span class='ident'>err</span>) <span class='op'>=&gt;</span> <span class='ident'>err</span>.<span class='ident'>fmt</span>(<span class='ident'>f</span>),
            <span class='ident'>Error</span>::<span class='ident'>CompiledTooBig</span>(<span class='ident'>limit</span>) <span class='op'>=&gt;</span> {
                <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Compiled regex exceeds size limit of {} bytes.&quot;</span>,
                       <span class='ident'>limit</span>)
            }
            <span class='ident'>Error</span>::<span class='ident'>__Nonexhaustive</span> <span class='op'>=&gt;</span> <span class='macro'>unreachable</span><span class='macro'>!</span>(),
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>From</span><span class='op'>&lt;</span><span class='ident'>syntax</span>::<span class='ident'>Error</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>Error</span> {
    <span class='kw'>fn</span> <span class='ident'>from</span>(<span class='ident'>err</span>: <span class='ident'>syntax</span>::<span class='ident'>Error</span>) <span class='op'>-&gt;</span> <span class='ident'>Error</span> {
        <span class='ident'>Error</span>::<span class='ident'>Syntax</span>(<span class='ident'>err</span>)
    }
}

<span class='doccomment'>/// A compiled regular expression</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It is represented as either a sequence of bytecode instructions (dynamic)</span>
<span class='doccomment'>/// or as a specialized Rust function (native). It can be used to search, split</span>
<span class='doccomment'>/// or replace text. All searching is done with an implicit `.*?` at the</span>
<span class='doccomment'>/// beginning and end of an expression. To force an expression to match the</span>
<span class='doccomment'>/// whole string (or a prefix or a suffix), you must use an anchor like `^` or</span>
<span class='doccomment'>/// `$` (or `\A` and `\z`).</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// While this crate will handle Unicode strings (whether in the regular</span>
<span class='doccomment'>/// expression or in the search text), all positions returned are **byte</span>
<span class='doccomment'>/// indices**. Every byte index is guaranteed to be at a Unicode code point</span>
<span class='doccomment'>/// boundary.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The lifetimes `&#39;r` and `&#39;t` in this crate correspond to the lifetime of a</span>
<span class='doccomment'>/// compiled regular expression and text to search, respectively.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The only methods that allocate new strings are the string replacement</span>
<span class='doccomment'>/// methods. All other methods (searching and splitting) return borrowed</span>
<span class='doccomment'>/// pointers into the string given.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Examples</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Find the location of a US phone number:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// # use regex::Regex;</span>
<span class='doccomment'>/// let re = Regex::new(&quot;[0-9]{3}-[0-9]{3}-[0-9]{4}&quot;).unwrap();</span>
<span class='doccomment'>/// assert_eq!(re.find(&quot;phone: 111-222-3333&quot;), Some((7, 19)));</span>
<span class='doccomment'>/// ```</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Using the `std::str::StrExt` methods with `Regex`</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// &gt; **Note**: This section requires that this crate is currently compiled with</span>
<span class='doccomment'>/// &gt;           the `pattern` Cargo feature enabled.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Since `Regex` implements `Pattern`, you can use regexes with methods</span>
<span class='doccomment'>/// defined on `std::str::StrExt`. For example, `is_match`, `find`, `find_iter`</span>
<span class='doccomment'>/// and `split` can be replaced with `StrExt::contains`, `StrExt::find`,</span>
<span class='doccomment'>/// `StrExt::match_indices` and `StrExt::split`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Here are some examples:</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// # use regex::Regex;</span>
<span class='doccomment'>/// let re = Regex::new(r&quot;\d+&quot;).unwrap();</span>
<span class='doccomment'>/// let haystack = &quot;a111b222c&quot;;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// assert!(haystack.contains(&amp;re));</span>
<span class='doccomment'>/// assert_eq!(haystack.find(&amp;re), Some(1));</span>
<span class='doccomment'>/// assert_eq!(haystack.match_indices(&amp;re).collect::&lt;Vec&lt;_&gt;&gt;(),</span>
<span class='doccomment'>///            vec![(1, 4), (5, 8)]);</span>
<span class='doccomment'>/// assert_eq!(haystack.split(&amp;re).collect::&lt;Vec&lt;_&gt;&gt;(), vec![&quot;a&quot;, &quot;b&quot;, &quot;c&quot;]);</span>
<span class='doccomment'>/// ```</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Regex</span> {
    <span class='comment'>// The representation of `Regex` is exported to support the `regex!`</span>
    <span class='comment'>// syntax extension. Do not rely on it.</span>
    <span class='comment'>//</span>
    <span class='comment'>// See the comments for the `program` module in `lib.rs` for a more</span>
    <span class='comment'>// detailed explanation for what `regex!` requires.</span>
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='ident'>Dynamic</span>(<span class='ident'>Program</span>),
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='ident'>Native</span>(<span class='ident'>ExNative</span>),
}

<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ExNative</span> {
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='kw'>pub</span> <span class='ident'>original</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>,
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='kw'>pub</span> <span class='ident'>names</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> [<span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span><span class='op'>&gt;</span>],
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='kw'>pub</span> <span class='ident'>prog</span>: <span class='kw'>fn</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>CaptureIdxs</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>,
}

<span class='kw'>impl</span> <span class='ident'>Copy</span> <span class='kw'>for</span> <span class='ident'>ExNative</span> {}

<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>ExNative</span> {
    <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>ExNative</span> {
        <span class='op'>*</span><span class='self'>self</span>
    }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Regex</span> {
    <span class='doccomment'>/// Shows the original regular expression.</span>
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='self'>self</span>.<span class='ident'>as_str</span>())
    }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>Regex</span> {
    <span class='doccomment'>/// Shows the original regular expression.</span>
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='ident'>fmt</span>::<span class='ident'>Display</span>::<span class='ident'>fmt</span>(<span class='self'>self</span>, <span class='ident'>f</span>)
    }
}

<span class='doccomment'>/// Equality comparison is based on the original string. It is possible that</span>
<span class='doccomment'>/// different regular expressions have the same matching behavior, but are</span>
<span class='doccomment'>/// still compared unequal. For example, `\d+` and `\d\d*` match the same set</span>
<span class='doccomment'>/// of strings, but are not considered equal.</span>
<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>Regex</span> {
    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>Regex</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='self'>self</span>.<span class='ident'>as_str</span>() <span class='op'>==</span> <span class='ident'>other</span>.<span class='ident'>as_str</span>()
    }
}

<span class='kw'>impl</span> <span class='ident'>Eq</span> <span class='kw'>for</span> <span class='ident'>Regex</span> {}

<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>Regex</span> {
    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> <span class='ident'>Error</span>;

    <span class='doccomment'>/// Attempts to parse a string into a regular expression</span>
    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Regex</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
        <span class='ident'>Regex</span>::<span class='ident'>new</span>(<span class='ident'>s</span>)
    }
}

<span class='kw'>impl</span> <span class='ident'>Regex</span> {
    <span class='doccomment'>/// Compiles a dynamic regular expression. Once compiled, it can be</span>
    <span class='doccomment'>/// used repeatedly to search, split or replace text in a string.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If an invalid expression is given, then an error is returned.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Regex</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
        <span class='ident'>Regex</span>::<span class='ident'>with_size_limit</span>(<span class='number'>10</span> <span class='op'>*</span> (<span class='number'>1</span> <span class='op'>&lt;&lt;</span> <span class='number'>20</span>), <span class='ident'>re</span>)
    }

    <span class='doccomment'>/// Compiles a dynamic regular expression with the given size limit.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The size limit is applied to the size of the *compiled* data structure.</span>
    <span class='doccomment'>/// If the data structure exceeds the size given, then an error is</span>
    <span class='doccomment'>/// returned.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The default size limit used in `new` is 10MB.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_size_limit</span>(<span class='ident'>size</span>: <span class='ident'>usize</span>, <span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Regex</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
        <span class='ident'>Regex</span>::<span class='ident'>with_engine</span>(<span class='prelude-val'>None</span>, <span class='ident'>size</span>, <span class='ident'>re</span>)
    }

    <span class='doccomment'>/// Compiles a dynamic regular expression and uses given matching engine.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// This is exposed for use in testing and shouldn&#39;t be used by clients.</span>
    <span class='doccomment'>/// Instead, the regex program should choose the correct matching engine</span>
    <span class='doccomment'>/// to use automatically. (Based on the regex, the size of the input and</span>
    <span class='doccomment'>/// the type of search.)</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// A value of `None` means that the engine is automatically selected,</span>
    <span class='doccomment'>/// which is the default behavior.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// **WARNING**: Passing an unsuitable engine for the given regex/input</span>
    <span class='doccomment'>/// could lead to bad things. (Not unsafe things, but panics, incorrect</span>
    <span class='doccomment'>/// matches and large memory use are all things that could happen.)</span>
    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_engine</span>(
        <span class='ident'>engine</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>MatchEngine</span><span class='op'>&gt;</span>,
        <span class='ident'>size</span>: <span class='ident'>usize</span>,
        <span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>,
    ) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Regex</span>, <span class='ident'>Error</span><span class='op'>&gt;</span> {
        <span class='ident'>Program</span>::<span class='ident'>new</span>(<span class='ident'>engine</span>, <span class='ident'>size</span>, <span class='ident'>re</span>).<span class='ident'>map</span>(<span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>)
    }


    <span class='doccomment'>/// Returns true if and only if the regex matches the string given.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Test if some text contains at least one word with exactly 13</span>
    <span class='doccomment'>/// characters:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let text = &quot;I categorically deny having triskaidekaphobia.&quot;;</span>
    <span class='doccomment'>/// assert!(Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().is_match(text));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_match</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='ident'>exec</span>(<span class='self'>self</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> [], <span class='ident'>text</span>, <span class='number'>0</span>)
    }

    <span class='doccomment'>/// Returns the start and end byte range of the leftmost-first match in</span>
    <span class='doccomment'>/// `text`. If no match exists, then `None` is returned.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Note that this should only be used if you want to discover the position</span>
    <span class='doccomment'>/// of the match. Testing the existence of a match is faster if you use</span>
    <span class='doccomment'>/// `is_match`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Find the start and end location of the first word with exactly 13</span>
    <span class='doccomment'>/// characters:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let text = &quot;I categorically deny having triskaidekaphobia.&quot;;</span>
    <span class='doccomment'>/// let pos = Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find(text);</span>
    <span class='doccomment'>/// assert_eq!(pos, Some((2, 15)));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>find</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>caps</span> <span class='op'>=</span> [<span class='prelude-val'>None</span>, <span class='prelude-val'>None</span>];
        <span class='kw'>if</span> <span class='ident'>exec</span>(<span class='self'>self</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>caps</span>, <span class='ident'>text</span>, <span class='number'>0</span>) {
            <span class='prelude-val'>Some</span>((<span class='ident'>caps</span>[<span class='number'>0</span>].<span class='ident'>unwrap</span>(), <span class='ident'>caps</span>[<span class='number'>1</span>].<span class='ident'>unwrap</span>()))
        } <span class='kw'>else</span> {
            <span class='prelude-val'>None</span>
        }
    }

    <span class='doccomment'>/// Returns an iterator for each successive non-overlapping match in</span>
    <span class='doccomment'>/// `text`, returning the start and end byte indices with respect to</span>
    <span class='doccomment'>/// `text`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Find the start and end location of every word with exactly 13</span>
    <span class='doccomment'>/// characters:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let text = &quot;Retroactively relinquishing remunerations is reprehensible.&quot;;</span>
    <span class='doccomment'>/// for pos in Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find_iter(text) {</span>
    <span class='doccomment'>///     println!(&quot;{:?}&quot;, pos);</span>
    <span class='doccomment'>/// }</span>
    <span class='doccomment'>/// // Output:</span>
    <span class='doccomment'>/// // (0, 13)</span>
    <span class='doccomment'>/// // (14, 27)</span>
    <span class='doccomment'>/// // (28, 41)</span>
    <span class='doccomment'>/// // (45, 58)</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>find_iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>FindMatches</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>FindMatches</span> {
            <span class='ident'>re</span>: <span class='self'>self</span>,
            <span class='ident'>search</span>: <span class='ident'>text</span>,
            <span class='ident'>last_end</span>: <span class='number'>0</span>,
            <span class='ident'>last_match</span>: <span class='prelude-val'>None</span>,
        }
    }

    <span class='doccomment'>/// Returns the capture groups corresponding to the leftmost-first</span>
    <span class='doccomment'>/// match in `text`. Capture group `0` always corresponds to the entire</span>
    <span class='doccomment'>/// match. If no match is found, then `None` is returned.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// You should only use `captures` if you need access to submatches.</span>
    <span class='doccomment'>/// Otherwise, `find` is faster for discovering the location of the overall</span>
    <span class='doccomment'>/// match.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Examples</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Say you have some text with movie names and their release years,</span>
    <span class='doccomment'>/// like &quot;&#39;Citizen Kane&#39; (1941)&quot;. It&#39;d be nice if we could search for text</span>
    <span class='doccomment'>/// looking like that, while also extracting the movie name and its release</span>
    <span class='doccomment'>/// year separately.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;&#39;([^&#39;]+)&#39;\s+\((\d{4})\)&quot;).unwrap();</span>
    <span class='doccomment'>/// let text = &quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;</span>
    <span class='doccomment'>/// let caps = re.captures(text).unwrap();</span>
    <span class='doccomment'>/// assert_eq!(caps.at(1), Some(&quot;Citizen Kane&quot;));</span>
    <span class='doccomment'>/// assert_eq!(caps.at(2), Some(&quot;1941&quot;));</span>
    <span class='doccomment'>/// assert_eq!(caps.at(0), Some(&quot;&#39;Citizen Kane&#39; (1941)&quot;));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Note that the full match is at capture group `0`. Each subsequent</span>
    <span class='doccomment'>/// capture group is indexed by the order of its opening `(`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// We can make this example a bit clearer by using *named* capture groups:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)</span>
    <span class='doccomment'>///                .unwrap();</span>
    <span class='doccomment'>/// let text = &quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;</span>
    <span class='doccomment'>/// let caps = re.captures(text).unwrap();</span>
    <span class='doccomment'>/// assert_eq!(caps.name(&quot;title&quot;), Some(&quot;Citizen Kane&quot;));</span>
    <span class='doccomment'>/// assert_eq!(caps.name(&quot;year&quot;), Some(&quot;1941&quot;));</span>
    <span class='doccomment'>/// assert_eq!(caps.at(0), Some(&quot;&#39;Citizen Kane&#39; (1941)&quot;));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Here we name the capture groups, which we can access with the `name`</span>
    <span class='doccomment'>/// method. Note that the named capture groups are still accessible with</span>
    <span class='doccomment'>/// `at`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The `0`th capture group is always unnamed, so it must always be</span>
    <span class='doccomment'>/// accessed with `at(0)`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>caps</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>alloc_captures</span>();
        <span class='kw'>if</span> <span class='ident'>exec</span>(<span class='self'>self</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>caps</span>, <span class='ident'>text</span>, <span class='number'>0</span>) {
            <span class='prelude-val'>Some</span>(<span class='ident'>Captures</span>::<span class='ident'>new</span>(<span class='self'>self</span>, <span class='ident'>text</span>, <span class='ident'>caps</span>))
        } <span class='kw'>else</span> {
            <span class='prelude-val'>None</span>
        }
    }

    <span class='doccomment'>/// Returns an iterator over all the non-overlapping capture groups matched</span>
    <span class='doccomment'>/// in `text`. This is operationally the same as `find_iter` (except it</span>
    <span class='doccomment'>/// yields information about submatches).</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// We can use this to find all movie titles and their release years in</span>
    <span class='doccomment'>/// some text, where the movie is formatted like &quot;&#39;Title&#39; (xxxx)&quot;:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)</span>
    <span class='doccomment'>///                .unwrap();</span>
    <span class='doccomment'>/// let text = &quot;&#39;Citizen Kane&#39; (1941), &#39;The Wizard of Oz&#39; (1939), &#39;M&#39; (1931).&quot;;</span>
    <span class='doccomment'>/// for caps in re.captures_iter(text) {</span>
    <span class='doccomment'>///     println!(&quot;Movie: {:?}, Released: {:?}&quot;, caps.name(&quot;title&quot;), caps.name(&quot;year&quot;));</span>
    <span class='doccomment'>/// }</span>
    <span class='doccomment'>/// // Output:</span>
    <span class='doccomment'>/// // Movie: Citizen Kane, Released: 1941</span>
    <span class='doccomment'>/// // Movie: The Wizard of Oz, Released: 1939</span>
    <span class='doccomment'>/// // Movie: M, Released: 1931</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>captures_iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>)
                                <span class='op'>-&gt;</span> <span class='ident'>FindCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>FindCaptures</span> {
            <span class='ident'>re</span>: <span class='self'>self</span>,
            <span class='ident'>search</span>: <span class='ident'>text</span>,
            <span class='ident'>last_match</span>: <span class='prelude-val'>None</span>,
            <span class='ident'>last_end</span>: <span class='number'>0</span>,
        }
    }

    <span class='doccomment'>/// Returns an iterator of substrings of `text` delimited by a match</span>
    <span class='doccomment'>/// of the regular expression.</span>
    <span class='doccomment'>/// Namely, each element of the iterator corresponds to text that *isn&#39;t*</span>
    <span class='doccomment'>/// matched by the regular expression.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// This method will *not* copy the text given.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// To split a string delimited by arbitrary amounts of spaces or tabs:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;[ \t]+&quot;).unwrap();</span>
    <span class='doccomment'>/// let fields: Vec&lt;&amp;str&gt; = re.split(&quot;a b \t  c\td    e&quot;).collect();</span>
    <span class='doccomment'>/// assert_eq!(fields, vec!(&quot;a&quot;, &quot;b&quot;, &quot;c&quot;, &quot;d&quot;, &quot;e&quot;));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>split</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>RegexSplits</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>RegexSplits</span> {
            <span class='ident'>finder</span>: <span class='self'>self</span>.<span class='ident'>find_iter</span>(<span class='ident'>text</span>),
            <span class='ident'>last</span>: <span class='number'>0</span>,
        }
    }

    <span class='doccomment'>/// Returns an iterator of at most `limit` substrings of `text` delimited</span>
    <span class='doccomment'>/// by a match of the regular expression. (A `limit` of `0` will return no</span>
    <span class='doccomment'>/// substrings.)</span>
    <span class='doccomment'>/// Namely, each element of the iterator corresponds to text that *isn&#39;t*</span>
    <span class='doccomment'>/// matched by the regular expression.</span>
    <span class='doccomment'>/// The remainder of the string that is not split will be the last element</span>
    <span class='doccomment'>/// in the iterator.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// This method will *not* copy the text given.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Example</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Get the first two words in some text:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;\W+&quot;).unwrap();</span>
    <span class='doccomment'>/// let fields: Vec&lt;&amp;str&gt; = re.splitn(&quot;Hey! How are you?&quot;, 3).collect();</span>
    <span class='doccomment'>/// assert_eq!(fields, vec!(&quot;Hey&quot;, &quot;How&quot;, &quot;are you?&quot;));</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>splitn</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>, <span class='ident'>limit</span>: <span class='ident'>usize</span>)
                         <span class='op'>-&gt;</span> <span class='ident'>RegexSplitsN</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>RegexSplitsN</span> {
            <span class='ident'>splits</span>: <span class='self'>self</span>.<span class='ident'>split</span>(<span class='ident'>text</span>),
            <span class='ident'>cur</span>: <span class='number'>0</span>,
            <span class='ident'>limit</span>: <span class='ident'>limit</span>,
        }
    }

    <span class='doccomment'>/// Replaces the leftmost-first match with the replacement provided.</span>
    <span class='doccomment'>/// The replacement can be a regular string (where `$N` and `$name` are</span>
    <span class='doccomment'>/// expanded to match capture groups) or a function that takes the matches&#39;</span>
    <span class='doccomment'>/// `Captures` and returns the replaced string.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If no match is found, then a copy of the string is returned unchanged.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Examples</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Note that this function is polymorphic with respect to the replacement.</span>
    <span class='doccomment'>/// In typical usage, this can just be a normal string:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(&quot;[^01]+&quot;).unwrap();</span>
    <span class='doccomment'>/// assert_eq!(re.replace(&quot;1078910&quot;, &quot;&quot;), &quot;1010&quot;);</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// But anything satisfying the `Replacer` trait will work. For example,</span>
    <span class='doccomment'>/// a closure of type `|&amp;Captures| -&gt; String` provides direct access to the</span>
    <span class='doccomment'>/// captures corresponding to a match. This allows one to access</span>
    <span class='doccomment'>/// submatches easily:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # use regex::Captures; fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;([^,\s]+),\s+(\S+)&quot;).unwrap();</span>
    <span class='doccomment'>/// let result = re.replace(&quot;Springsteen, Bruce&quot;, |caps: &amp;Captures| {</span>
    <span class='doccomment'>///     format!(&quot;{} {}&quot;, caps.at(2).unwrap_or(&quot;&quot;), caps.at(1).unwrap_or(&quot;&quot;))</span>
    <span class='doccomment'>/// });</span>
    <span class='doccomment'>/// assert_eq!(result, &quot;Bruce Springsteen&quot;);</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// But this is a bit cumbersome to use all the time. Instead, a simple</span>
    <span class='doccomment'>/// syntax is supported that expands `$name` into the corresponding capture</span>
    <span class='doccomment'>/// group. Here&#39;s the last example, but using this expansion technique</span>
    <span class='doccomment'>/// with named capture groups:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(?P&lt;first&gt;\S+)&quot;).unwrap();</span>
    <span class='doccomment'>/// let result = re.replace(&quot;Springsteen, Bruce&quot;, &quot;$first $last&quot;);</span>
    <span class='doccomment'>/// assert_eq!(result, &quot;Bruce Springsteen&quot;);</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Note that using `$2` instead of `$first` or `$1` instead of `$last`</span>
    <span class='doccomment'>/// would produce the same result. To write a literal `$` use `$$`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Finally, sometimes you just want to replace a literal string with no</span>
    <span class='doccomment'>/// submatch expansion. This can be done by wrapping a string with</span>
    <span class='doccomment'>/// `NoExpand`:</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```rust</span>
    <span class='doccomment'>/// # extern crate regex; use regex::Regex;</span>
    <span class='doccomment'>/// # fn main() {</span>
    <span class='doccomment'>/// use regex::NoExpand;</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(\S+)&quot;).unwrap();</span>
    <span class='doccomment'>/// let result = re.replace(&quot;Springsteen, Bruce&quot;, NoExpand(&quot;$2 $last&quot;));</span>
    <span class='doccomment'>/// assert_eq!(result, &quot;$2 $last&quot;);</span>
    <span class='doccomment'>/// # }</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>replace</span><span class='op'>&lt;</span><span class='ident'>R</span>: <span class='ident'>Replacer</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>rep</span>: <span class='ident'>R</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='self'>self</span>.<span class='ident'>replacen</span>(<span class='ident'>text</span>, <span class='number'>1</span>, <span class='ident'>rep</span>)
    }

    <span class='doccomment'>/// Replaces all non-overlapping matches in `text` with the</span>
    <span class='doccomment'>/// replacement provided. This is the same as calling `replacen` with</span>
    <span class='doccomment'>/// `limit` set to `0`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// See the documentation for `replace` for details on how to access</span>
    <span class='doccomment'>/// submatches in the replacement string.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>replace_all</span><span class='op'>&lt;</span><span class='ident'>R</span>: <span class='ident'>Replacer</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>rep</span>: <span class='ident'>R</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='self'>self</span>.<span class='ident'>replacen</span>(<span class='ident'>text</span>, <span class='number'>0</span>, <span class='ident'>rep</span>)
    }

    <span class='doccomment'>/// Replaces at most `limit` non-overlapping matches in `text` with the</span>
    <span class='doccomment'>/// replacement provided. If `limit` is 0, then all non-overlapping matches</span>
    <span class='doccomment'>/// are replaced.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// See the documentation for `replace` for details on how to access</span>
    <span class='doccomment'>/// submatches in the replacement string.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>replacen</span><span class='op'>&lt;</span><span class='ident'>R</span>: <span class='ident'>Replacer</span><span class='op'>&gt;</span>
                   (<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>limit</span>: <span class='ident'>usize</span>, <span class='kw-2'>mut</span> <span class='ident'>rep</span>: <span class='ident'>R</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>());
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>last_match</span> <span class='op'>=</span> <span class='number'>0</span>;

        <span class='kw'>if</span> <span class='ident'>rep</span>.<span class='ident'>no_expand</span>().<span class='ident'>is_some</span>() {
            <span class='comment'>// borrow checker pains. `rep` is borrowed mutably in the `else`</span>
            <span class='comment'>// branch below.</span>
            <span class='kw'>let</span> <span class='ident'>rep</span> <span class='op'>=</span> <span class='ident'>rep</span>.<span class='ident'>no_expand</span>().<span class='ident'>unwrap</span>();
            <span class='kw'>for</span> (<span class='ident'>i</span>, (<span class='ident'>s</span>, <span class='ident'>e</span>)) <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>find_iter</span>(<span class='ident'>text</span>).<span class='ident'>enumerate</span>() {
                <span class='kw'>if</span> <span class='ident'>limit</span> <span class='op'>&gt;</span> <span class='number'>0</span> <span class='op'>&amp;&amp;</span> <span class='ident'>i</span> <span class='op'>&gt;=</span> <span class='ident'>limit</span> {
                    <span class='kw'>break</span>
                }
                <span class='ident'>new</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='ident'>last_match</span>..<span class='ident'>s</span>]);
                <span class='ident'>new</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>rep</span>);
                <span class='ident'>last_match</span> <span class='op'>=</span> <span class='ident'>e</span>;
            }
        } <span class='kw'>else</span> {
            <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>cap</span>) <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>captures_iter</span>(<span class='ident'>text</span>).<span class='ident'>enumerate</span>() {
                <span class='kw'>if</span> <span class='ident'>limit</span> <span class='op'>&gt;</span> <span class='number'>0</span> <span class='op'>&amp;&amp;</span> <span class='ident'>i</span> <span class='op'>&gt;=</span> <span class='ident'>limit</span> {
                    <span class='kw'>break</span>
                }
                <span class='comment'>// unwrap on 0 is OK because captures only reports matches</span>
                <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> <span class='ident'>cap</span>.<span class='ident'>pos</span>(<span class='number'>0</span>).<span class='ident'>unwrap</span>();
                <span class='ident'>new</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='ident'>last_match</span>..<span class='ident'>s</span>]);
                <span class='ident'>new</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>rep</span>.<span class='ident'>reg_replace</span>(<span class='kw-2'>&amp;</span><span class='ident'>cap</span>));
                <span class='ident'>last_match</span> <span class='op'>=</span> <span class='ident'>e</span>;
            }
        }
        <span class='ident'>new</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='ident'>last_match</span>..]);
        <span class='ident'>new</span>
    }

    <span class='doccomment'>/// Returns the original string of this regex.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>as_str</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>(<span class='ident'>Program</span> { <span class='kw-2'>ref</span> <span class='ident'>original</span>, .. }) <span class='op'>=&gt;</span> <span class='ident'>original</span>,
            <span class='ident'>Regex</span>::<span class='ident'>Native</span>(<span class='ident'>ExNative</span> { <span class='kw-2'>ref</span> <span class='ident'>original</span>, .. }) <span class='op'>=&gt;</span> <span class='ident'>original</span>,
        }
    }

    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>names_iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>NamesIter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Regex</span>::<span class='ident'>Native</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>) <span class='op'>=&gt;</span> <span class='ident'>NamesIter</span>::<span class='ident'>Native</span>(<span class='ident'>n</span>.<span class='ident'>names</span>.<span class='ident'>iter</span>()),
            <span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>(<span class='kw-2'>ref</span> <span class='ident'>d</span>) <span class='op'>=&gt;</span> <span class='ident'>NamesIter</span>::<span class='ident'>Dynamic</span>(<span class='ident'>d</span>.<span class='ident'>cap_names</span>.<span class='ident'>iter</span>())
        }
    }

    <span class='kw'>fn</span> <span class='ident'>names_len</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Regex</span>::<span class='ident'>Native</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>) <span class='op'>=&gt;</span> <span class='ident'>n</span>.<span class='ident'>names</span>.<span class='ident'>len</span>(),
            <span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>(<span class='kw-2'>ref</span> <span class='ident'>d</span>) <span class='op'>=&gt;</span> <span class='ident'>d</span>.<span class='ident'>cap_names</span>.<span class='ident'>len</span>()
        }
    }

    <span class='kw'>fn</span> <span class='ident'>alloc_captures</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>Regex</span>::<span class='ident'>Native</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>) <span class='op'>=&gt;</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='prelude-val'>None</span>; <span class='number'>2</span> <span class='op'>*</span> <span class='ident'>n</span>.<span class='ident'>names</span>.<span class='ident'>len</span>()],
            <span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>(<span class='kw-2'>ref</span> <span class='ident'>d</span>) <span class='op'>=&gt;</span> <span class='ident'>d</span>.<span class='ident'>alloc_captures</span>(),
        }
    }
}

<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>NamesIter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='ident'>Native</span>(::<span class='ident'>std</span>::<span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span><span class='op'>&gt;&gt;</span>),
    <span class='ident'>Dynamic</span>(::<span class='ident'>std</span>::<span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;&gt;</span>)
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>NamesIter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span><span class='op'>=</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>String</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
            <span class='ident'>NamesIter</span>::<span class='ident'>Native</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>i</span>) <span class='op'>=&gt;</span>
                <span class='ident'>i</span>.<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>s</span><span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>to_owned</span>())),
            <span class='ident'>NamesIter</span>::<span class='ident'>Dynamic</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>i</span>) <span class='op'>=&gt;</span>
                <span class='ident'>i</span>.<span class='ident'>next</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>as_ref</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>s</span><span class='op'>|</span> <span class='ident'>s</span>.<span class='ident'>to_owned</span>())),
        }
    }
}

<span class='doccomment'>/// NoExpand indicates literal string replacement.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// It can be used with `replace` and `replace_all` to do a literal</span>
<span class='doccomment'>/// string replacement without expanding `$name` to their corresponding</span>
<span class='doccomment'>/// capture groups.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;r` is the lifetime of the literal text.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>NoExpand</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>(<span class='kw'>pub</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>);

<span class='doccomment'>/// Replacer describes types that can be used to replace matches in a string.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Replacer</span> {
    <span class='doccomment'>/// Returns a possibly owned string that is used to replace the match</span>
    <span class='doccomment'>/// corresponding to the `caps` capture group.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// The `&#39;a` lifetime refers to the lifetime of a borrowed string when</span>
    <span class='doccomment'>/// a new owned string isn&#39;t needed (e.g., for `NoExpand`).</span>
    <span class='kw'>fn</span> <span class='ident'>reg_replace</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='ident'>Captures</span>) <span class='op'>-&gt;</span> <span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;</span>;

    <span class='doccomment'>/// Returns a possibly owned string that never needs expansion.</span>
    <span class='kw'>fn</span> <span class='ident'>no_expand</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;&gt;</span> { <span class='prelude-val'>None</span> }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Replacer</span> <span class='kw'>for</span> <span class='ident'>NoExpand</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>fn</span> <span class='ident'>reg_replace</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>, _: <span class='kw-2'>&amp;</span><span class='ident'>Captures</span>) <span class='op'>-&gt;</span> <span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>into</span>()
    }

    <span class='kw'>fn</span> <span class='ident'>no_expand</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;&gt;</span> {
        <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>into</span>())
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Replacer</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span> {
    <span class='kw'>fn</span> <span class='ident'>reg_replace</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='ident'>Captures</span>) <span class='op'>-&gt;</span> <span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='ident'>caps</span>.<span class='ident'>expand</span>(<span class='op'>*</span><span class='self'>self</span>).<span class='ident'>into</span>()
    }

    <span class='kw'>fn</span> <span class='ident'>no_expand</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>re</span> <span class='op'>=</span> <span class='ident'>Regex</span>::<span class='ident'>new</span>(<span class='ident'>REPLACE_EXPAND</span>).<span class='ident'>unwrap</span>();
        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>re</span>.<span class='ident'>is_match</span>(<span class='self'>self</span>) {
            <span class='prelude-val'>Some</span>((<span class='op'>*</span><span class='self'>self</span>).<span class='ident'>into</span>())
        } <span class='kw'>else</span> {
            <span class='prelude-val'>None</span>
        }
    }
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span> <span class='ident'>Replacer</span> <span class='kw'>for</span> <span class='ident'>F</span> <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>FnMut</span>(<span class='kw-2'>&amp;</span><span class='ident'>Captures</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
    <span class='kw'>fn</span> <span class='ident'>reg_replace</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='ident'>Captures</span>) <span class='op'>-&gt;</span> <span class='ident'>Cow</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>str</span><span class='op'>&gt;</span> {
        (<span class='op'>*</span><span class='self'>self</span>)(<span class='ident'>caps</span>).<span class='ident'>into</span>()
    }
}

<span class='doccomment'>/// Yields all substrings delimited by a regular expression match.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;r` is the lifetime of the compiled expression and `&#39;t` is the lifetime</span>
<span class='doccomment'>/// of the string being split.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>RegexSplits</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>finder</span>: <span class='ident'>FindMatches</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
    <span class='ident'>last</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>RegexSplits</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>text</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>finder</span>.<span class='ident'>search</span>;
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>finder</span>.<span class='ident'>next</span>() {
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
                <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last</span> <span class='op'>&gt;=</span> <span class='ident'>text</span>.<span class='ident'>len</span>() {
                    <span class='prelude-val'>None</span>
                } <span class='kw'>else</span> {
                    <span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>last</span>..];
                    <span class='self'>self</span>.<span class='ident'>last</span> <span class='op'>=</span> <span class='ident'>text</span>.<span class='ident'>len</span>();
                    <span class='prelude-val'>Some</span>(<span class='ident'>s</span>)
                }
            }
            <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>)) <span class='op'>=&gt;</span> {
                <span class='kw'>let</span> <span class='ident'>matched</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>last</span>..<span class='ident'>s</span>];
                <span class='self'>self</span>.<span class='ident'>last</span> <span class='op'>=</span> <span class='ident'>e</span>;
                <span class='prelude-val'>Some</span>(<span class='ident'>matched</span>)
            }
        }
    }
}

<span class='doccomment'>/// Yields at most `N` substrings delimited by a regular expression match.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The last substring will be whatever remains after splitting.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;r` is the lifetime of the compiled expression and `&#39;t` is the lifetime</span>
<span class='doccomment'>/// of the string being split.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>RegexSplitsN</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>splits</span>: <span class='ident'>RegexSplits</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
    <span class='ident'>cur</span>: <span class='ident'>usize</span>,
    <span class='ident'>limit</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>RegexSplitsN</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>text</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>splits</span>.<span class='ident'>finder</span>.<span class='ident'>search</span>;
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&gt;=</span> <span class='self'>self</span>.<span class='ident'>limit</span> {
            <span class='prelude-val'>None</span>
        } <span class='kw'>else</span> {
            <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>+=</span> <span class='number'>1</span>;
            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cur</span> <span class='op'>&gt;=</span> <span class='self'>self</span>.<span class='ident'>limit</span> {
                <span class='prelude-val'>Some</span>(<span class='kw-2'>&amp;</span><span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>splits</span>.<span class='ident'>last</span>..])
            } <span class='kw'>else</span> {
                <span class='self'>self</span>.<span class='ident'>splits</span>.<span class='ident'>next</span>()
            }
        }
    }
}

<span class='doccomment'>/// Captures represents a group of captured strings for a single match.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The 0th capture always corresponds to the entire match. Each subsequent</span>
<span class='doccomment'>/// index corresponds to the next capture group in the regex.</span>
<span class='doccomment'>/// If a capture group is named, then the matched string is *also* available</span>
<span class='doccomment'>/// via the `name` method. (Note that the 0th capture is always unnamed and so</span>
<span class='doccomment'>/// must be accessed with the `at` method.)</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Positions returned from a capture group are always byte indices.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;t` is the lifetime of the matched text.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>,
    <span class='ident'>locs</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;&gt;</span>,
    <span class='ident'>named</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>HashMap</span><span class='op'>&lt;</span><span class='ident'>String</span>, <span class='ident'>usize</span><span class='op'>&gt;&gt;</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>fn</span> <span class='ident'>new</span>(
        <span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='ident'>Regex</span>,
        <span class='ident'>search</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>,
        <span class='ident'>locs</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;&gt;</span>,
    ) <span class='op'>-&gt;</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>named</span> <span class='op'>=</span>
            <span class='kw'>if</span> <span class='ident'>re</span>.<span class='ident'>names_len</span>() <span class='op'>==</span> <span class='number'>0</span> {
                <span class='prelude-val'>None</span>
            } <span class='kw'>else</span> {
                <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>named</span> <span class='op'>=</span> <span class='ident'>HashMap</span>::<span class='ident'>new</span>();
                <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>name</span>) <span class='kw'>in</span> <span class='ident'>re</span>.<span class='ident'>names_iter</span>().<span class='ident'>enumerate</span>() {
                    <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>name</span>) <span class='op'>=</span> <span class='ident'>name</span> {
                        <span class='ident'>named</span>.<span class='ident'>insert</span>(<span class='ident'>name</span>, <span class='ident'>i</span>);
                    }
                }
                <span class='prelude-val'>Some</span>(<span class='ident'>named</span>)
            };
        <span class='ident'>Captures</span> {
            <span class='ident'>text</span>: <span class='ident'>search</span>,
            <span class='ident'>locs</span>: <span class='ident'>locs</span>,
            <span class='ident'>named</span>: <span class='ident'>named</span>,
        }
    }

    <span class='doccomment'>/// Returns the start and end positions of the Nth capture group.</span>
    <span class='doccomment'>/// Returns `None` if `i` is not a valid capture group or if the capture</span>
    <span class='doccomment'>/// group did not match anything.</span>
    <span class='doccomment'>/// The positions returned are *always* byte indices with respect to the</span>
    <span class='doccomment'>/// original string matched.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>pos</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>i</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;</span> {
        <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='ident'>i</span> <span class='op'>*</span> <span class='number'>2</span>, <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>2</span> <span class='op'>+</span> <span class='number'>1</span>);
        <span class='kw'>if</span> <span class='ident'>e</span> <span class='op'>&gt;=</span> <span class='self'>self</span>.<span class='ident'>locs</span>.<span class='ident'>len</span>() <span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>locs</span>[<span class='ident'>s</span>].<span class='ident'>is_none</span>() {
            <span class='comment'>// VM guarantees that each pair of locations are both Some or None.</span>
            <span class='kw'>return</span> <span class='prelude-val'>None</span>
        }
        <span class='prelude-val'>Some</span>((<span class='self'>self</span>.<span class='ident'>locs</span>[<span class='ident'>s</span>].<span class='ident'>unwrap</span>(), <span class='self'>self</span>.<span class='ident'>locs</span>[<span class='ident'>e</span>].<span class='ident'>unwrap</span>()))
    }

    <span class='doccomment'>/// Returns the matched string for the capture group `i`.  If `i` isn&#39;t</span>
    <span class='doccomment'>/// a valid capture group or didn&#39;t match anything, then `None` is</span>
    <span class='doccomment'>/// returned.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>at</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>i</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>pos</span>(<span class='ident'>i</span>) {
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
            <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>)) <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>text</span>[<span class='ident'>s</span>..<span class='ident'>e</span>])
        }
    }

    <span class='doccomment'>/// Returns the matched string for the capture group named `name`.  If</span>
    <span class='doccomment'>/// `name` isn&#39;t a valid capture group or didn&#39;t match anything, then</span>
    <span class='doccomment'>/// `None` is returned.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>name</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>name</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>named</span> {
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
            <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>h</span>) <span class='op'>=&gt;</span> {
                <span class='kw'>match</span> <span class='ident'>h</span>.<span class='ident'>get</span>(<span class='ident'>name</span>) {
                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
                    <span class='prelude-val'>Some</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>at</span>(<span class='op'>*</span><span class='ident'>i</span>),
                }
            }
        }
    }

    <span class='doccomment'>/// Creates an iterator of all the capture groups in order of appearance</span>
    <span class='doccomment'>/// in the regular expression.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>iter</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>SubCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>SubCaptures</span> { <span class='ident'>idx</span>: <span class='number'>0</span>, <span class='ident'>caps</span>: <span class='self'>self</span>, }
    }

    <span class='doccomment'>/// Creates an iterator of all the capture group positions in order of</span>
    <span class='doccomment'>/// appearance in the regular expression. Positions are byte indices</span>
    <span class='doccomment'>/// in terms of the original string matched.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>iter_pos</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>SubCapturesPos</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>SubCapturesPos</span> { <span class='ident'>idx</span>: <span class='number'>0</span>, <span class='ident'>caps</span>: <span class='self'>self</span>, }
    }

    <span class='doccomment'>/// Creates an iterator of all named groups as an tuple with the group</span>
    <span class='doccomment'>/// name and the value. The iterator returns these values in arbitrary</span>
    <span class='doccomment'>/// order.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>iter_named</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>SubCapturesNamed</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>SubCapturesNamed</span> { <span class='ident'>caps</span>: <span class='self'>self</span>, <span class='ident'>inner</span>: <span class='self'>self</span>.<span class='ident'>named</span>.<span class='ident'>as_ref</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>n</span>.<span class='ident'>iter</span>()) }
    }

    <span class='doccomment'>/// Expands all instances of `$name` in `text` to the corresponding capture</span>
    <span class='doccomment'>/// group `name`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// `name` may be an integer corresponding to the index of the</span>
    <span class='doccomment'>/// capture group (counted by order of opening parenthesis where `0` is the</span>
    <span class='doccomment'>/// entire match) or it can be a name (consisting of letters, digits or</span>
    <span class='doccomment'>/// underscores) corresponding to a named capture group.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If `name` isn&#39;t a valid capture group (whether the name doesn&#39;t exist or</span>
    <span class='doccomment'>/// isn&#39;t a valid index), then it is replaced with the empty string.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// To write a literal `$` use `$$`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>expand</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='comment'>// How evil can you get?</span>
        <span class='kw'>let</span> <span class='ident'>re</span> <span class='op'>=</span> <span class='ident'>Regex</span>::<span class='ident'>new</span>(<span class='ident'>REPLACE_EXPAND</span>).<span class='ident'>unwrap</span>();
        <span class='kw'>let</span> <span class='ident'>text</span> <span class='op'>=</span> <span class='ident'>re</span>.<span class='ident'>replace_all</span>(<span class='ident'>text</span>, <span class='op'>|</span><span class='ident'>refs</span>: <span class='kw-2'>&amp;</span><span class='ident'>Captures</span><span class='op'>|</span> <span class='op'>-&gt;</span> <span class='ident'>String</span> {
            <span class='kw'>let</span> <span class='ident'>before</span> <span class='op'>=</span> <span class='ident'>refs</span>.<span class='ident'>name</span>(<span class='string'>&quot;before&quot;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>);
            <span class='kw'>let</span> <span class='ident'>name</span> <span class='op'>=</span> <span class='ident'>refs</span>.<span class='ident'>name</span>(<span class='string'>&quot;name&quot;</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>);
            <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>&quot;{}{}&quot;</span>, <span class='ident'>before</span>, <span class='kw'>match</span> <span class='ident'>name</span>.<span class='ident'>parse</span>::<span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>() {
                <span class='prelude-val'>Err</span>(_) <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>name</span>(<span class='ident'>name</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>).<span class='ident'>to_string</span>(),
                <span class='prelude-val'>Ok</span>(<span class='ident'>i</span>) <span class='op'>=&gt;</span> <span class='self'>self</span>.<span class='ident'>at</span>(<span class='ident'>i</span>).<span class='ident'>unwrap_or</span>(<span class='string'>&quot;&quot;</span>).<span class='ident'>to_string</span>(),
            })
        });
        <span class='kw'>let</span> <span class='ident'>re</span> <span class='op'>=</span> <span class='ident'>Regex</span>::<span class='ident'>new</span>(<span class='string'>r&quot;\$\$&quot;</span>).<span class='ident'>unwrap</span>();
        <span class='ident'>re</span>.<span class='ident'>replace_all</span>(<span class='kw-2'>&amp;</span><span class='ident'>text</span>, <span class='ident'>NoExpand</span>(<span class='string'>&quot;$&quot;</span>))
    }

    <span class='doccomment'>/// Returns the number of captured groups.</span>
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>len</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> { <span class='self'>self</span>.<span class='ident'>locs</span>.<span class='ident'>len</span>() <span class='op'>/</span> <span class='number'>2</span> }

    <span class='doccomment'>/// Returns true if and only if there are no captured groups.</span>
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_empty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>0</span> }
}

<span class='doccomment'>/// An iterator over capture groups for a particular match of a regular</span>
<span class='doccomment'>/// expression.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;t` is the lifetime of the matched text.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SubCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>idx</span>: <span class='ident'>usize</span>,
    <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>SubCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>caps</span>.<span class='ident'>len</span>() {
            <span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>+=</span> <span class='number'>1</span>;
            <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>caps</span>.<span class='ident'>at</span>(<span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>-</span> <span class='number'>1</span>))
        } <span class='kw'>else</span> {
            <span class='prelude-val'>None</span>
        }
    }
}

<span class='doccomment'>/// An iterator over capture group positions for a particular match of a</span>
<span class='doccomment'>/// regular expression.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Positions are byte indices in terms of the original string matched.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;t` is the lifetime of the matched text.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SubCapturesPos</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>idx</span>: <span class='ident'>usize</span>,
    <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>SubCapturesPos</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;&gt;</span> {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>caps</span>.<span class='ident'>len</span>() {
            <span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>+=</span> <span class='number'>1</span>;
            <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>caps</span>.<span class='ident'>pos</span>(<span class='self'>self</span>.<span class='ident'>idx</span> <span class='op'>-</span> <span class='number'>1</span>))
        } <span class='kw'>else</span> {
            <span class='prelude-val'>None</span>
        }
    }
}

<span class='doccomment'>/// An Iterator over named capture groups as a tuple with the group</span>
<span class='doccomment'>/// name and the value.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;t` is the lifetime of the matched text.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SubCapturesNamed</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>{
    <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
    <span class='ident'>inner</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Iter</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span>, <span class='ident'>String</span>, <span class='ident'>usize</span><span class='op'>&gt;&gt;</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>SubCapturesNamed</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> (<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>, <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span>);

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>, <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span><span class='op'>&gt;</span>)<span class='op'>&gt;</span> {
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>as_mut</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>it</span><span class='op'>|</span> <span class='ident'>it</span>.<span class='ident'>next</span>()).<span class='ident'>unwrap_or</span>(<span class='prelude-val'>None</span>) {
            <span class='prelude-val'>Some</span>((<span class='ident'>name</span>, <span class='ident'>pos</span>)) <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>((<span class='ident'>name</span>, <span class='self'>self</span>.<span class='ident'>caps</span>.<span class='ident'>at</span>(<span class='op'>*</span><span class='ident'>pos</span>))),
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>
        }
    }
}

<span class='doccomment'>/// An iterator that yields all non-overlapping capture groups matching a</span>
<span class='doccomment'>/// particular regular expression.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The iterator stops when no more matches can be found.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;r` is the lifetime of the compiled expression and `&#39;t` is the lifetime</span>
<span class='doccomment'>/// of the matched string.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>FindCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='ident'>Regex</span>,
    <span class='ident'>search</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>,
    <span class='ident'>last_match</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>,
    <span class='ident'>last_end</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>FindCaptures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>;

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Captures</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;&gt;</span> {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>&gt;</span> <span class='self'>self</span>.<span class='ident'>search</span>.<span class='ident'>len</span>() {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>
        }

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>caps</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>re</span>.<span class='ident'>alloc_captures</span>();
        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>exec</span>(<span class='self'>self</span>.<span class='ident'>re</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>caps</span>, <span class='self'>self</span>.<span class='ident'>search</span>, <span class='self'>self</span>.<span class='ident'>last_end</span>) {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>
        }
        <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='ident'>caps</span>[<span class='number'>0</span>].<span class='ident'>unwrap</span>(), <span class='ident'>caps</span>[<span class='number'>1</span>].<span class='ident'>unwrap</span>());

        <span class='comment'>// Don&#39;t accept empty matches immediately following a match.</span>
        <span class='comment'>// i.e., no infinite loops please.</span>
        <span class='kw'>if</span> <span class='ident'>e</span> <span class='op'>==</span> <span class='ident'>s</span> <span class='op'>&amp;&amp;</span> <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>last_end</span>) <span class='op'>==</span> <span class='self'>self</span>.<span class='ident'>last_match</span> {
            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>&gt;=</span> <span class='self'>self</span>.<span class='ident'>search</span>.<span class='ident'>len</span>() {
                <span class='kw'>return</span> <span class='prelude-val'>None</span>;
            }
            <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>+=</span> <span class='self'>self</span>.<span class='ident'>search</span>[<span class='self'>self</span>.<span class='ident'>last_end</span>..].<span class='ident'>chars</span>()
                                 .<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>len_utf8</span>();
            <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>next</span>()
        }
        <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>=</span> <span class='ident'>e</span>;
        <span class='self'>self</span>.<span class='ident'>last_match</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>last_end</span>);
        <span class='prelude-val'>Some</span>(<span class='ident'>Captures</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>re</span>, <span class='self'>self</span>.<span class='ident'>search</span>, <span class='ident'>caps</span>))
    }
}

<span class='doccomment'>/// An iterator over all non-overlapping matches for a particular string.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The iterator yields a tuple of integers corresponding to the start and end</span>
<span class='doccomment'>/// of the match. The indices are byte offsets. The iterator stops when no more</span>
<span class='doccomment'>/// matches can be found.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `&#39;r` is the lifetime of the compiled expression and `&#39;t` is the lifetime</span>
<span class='doccomment'>/// of the matched string.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>FindMatches</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='ident'>Regex</span>,
    <span class='ident'>search</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>,
    <span class='ident'>last_match</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span>,
    <span class='ident'>last_end</span>: <span class='ident'>usize</span>,
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>FindMatches</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> (<span class='ident'>usize</span>, <span class='ident'>usize</span>);

    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;</span> {
        <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>&gt;</span> <span class='self'>self</span>.<span class='ident'>search</span>.<span class='ident'>len</span>() {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>
        }

        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>caps</span> <span class='op'>=</span> [<span class='prelude-val'>None</span>, <span class='prelude-val'>None</span>];
        <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>exec</span>(<span class='self'>self</span>.<span class='ident'>re</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>caps</span>, <span class='self'>self</span>.<span class='ident'>search</span>, <span class='self'>self</span>.<span class='ident'>last_end</span>) {
            <span class='kw'>return</span> <span class='prelude-val'>None</span>;
        }
        <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='ident'>caps</span>[<span class='number'>0</span>].<span class='ident'>unwrap</span>(), <span class='ident'>caps</span>[<span class='number'>1</span>].<span class='ident'>unwrap</span>());

        <span class='comment'>// Don&#39;t accept empty matches immediately following a match.</span>
        <span class='comment'>// i.e., no infinite loops please.</span>
        <span class='kw'>if</span> <span class='ident'>e</span> <span class='op'>==</span> <span class='ident'>s</span> <span class='op'>&amp;&amp;</span> <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>last_end</span>) <span class='op'>==</span> <span class='self'>self</span>.<span class='ident'>last_match</span> {
            <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>&gt;=</span> <span class='self'>self</span>.<span class='ident'>search</span>.<span class='ident'>len</span>() {
                <span class='kw'>return</span> <span class='prelude-val'>None</span>;
            }
            <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>+=</span> <span class='self'>self</span>.<span class='ident'>search</span>[<span class='self'>self</span>.<span class='ident'>last_end</span>..].<span class='ident'>chars</span>()
                                 .<span class='ident'>next</span>().<span class='ident'>unwrap</span>().<span class='ident'>len_utf8</span>();
            <span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>next</span>()
        }
        <span class='self'>self</span>.<span class='ident'>last_end</span> <span class='op'>=</span> <span class='ident'>e</span>;
        <span class='self'>self</span>.<span class='ident'>last_match</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>last_end</span>);
        <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>))
    }
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>&quot;pattern&quot;</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>RegexSearcher</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='ident'>it</span>: <span class='ident'>FindMatches</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>,
    <span class='ident'>last_step_end</span>: <span class='ident'>usize</span>,
    <span class='ident'>next_match</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span>(<span class='ident'>usize</span>, <span class='ident'>usize</span>)<span class='op'>&gt;</span>,
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>&quot;pattern&quot;</span>)]</span>
<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Pattern</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;r</span> <span class='ident'>Regex</span> {
    <span class='kw'>type</span> <span class='ident'>Searcher</span> <span class='op'>=</span> <span class='ident'>RegexSearcher</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span>;

    <span class='kw'>fn</span> <span class='ident'>into_searcher</span>(<span class='self'>self</span>, <span class='ident'>haystack</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>RegexSearcher</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
        <span class='ident'>RegexSearcher</span> {
            <span class='ident'>it</span>: <span class='self'>self</span>.<span class='ident'>find_iter</span>(<span class='ident'>haystack</span>),
            <span class='ident'>last_step_end</span>: <span class='number'>0</span>,
            <span class='ident'>next_match</span>: <span class='prelude-val'>None</span>,
        }
    }
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>&quot;pattern&quot;</span>)]</span>
<span class='kw'>unsafe</span> <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='ident'>Searcher</span><span class='op'>&lt;</span><span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>RegexSearcher</span><span class='op'>&lt;</span><span class='lifetime'>&#39;r</span>, <span class='lifetime'>&#39;t</span><span class='op'>&gt;</span> {
    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>haystack</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;t</span> <span class='ident'>str</span> {
        <span class='self'>self</span>.<span class='ident'>it</span>.<span class='ident'>search</span>
    }

    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>SearchStep</span> {
        <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>)) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>next_match</span> {
            <span class='self'>self</span>.<span class='ident'>next_match</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
            <span class='self'>self</span>.<span class='ident'>last_step_end</span> <span class='op'>=</span> <span class='ident'>e</span>;
            <span class='kw'>return</span> <span class='ident'>SearchStep</span>::<span class='ident'>Match</span>(<span class='ident'>s</span>, <span class='ident'>e</span>);
        }
        <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>it</span>.<span class='ident'>next</span>() {
            <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {
                <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>last_step_end</span> <span class='op'>&lt;</span> <span class='self'>self</span>.<span class='ident'>haystack</span>().<span class='ident'>len</span>() {
                    <span class='kw'>let</span> <span class='ident'>last</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>last_step_end</span>;
                    <span class='self'>self</span>.<span class='ident'>last_step_end</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>haystack</span>().<span class='ident'>len</span>();
                    <span class='ident'>SearchStep</span>::<span class='ident'>Reject</span>(<span class='ident'>last</span>, <span class='self'>self</span>.<span class='ident'>haystack</span>().<span class='ident'>len</span>())
                } <span class='kw'>else</span> {
                    <span class='ident'>SearchStep</span>::<span class='ident'>Done</span>
                }
            }
            <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>)) <span class='op'>=&gt;</span> {
                <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='self'>self</span>.<span class='ident'>last_step_end</span> {
                    <span class='self'>self</span>.<span class='ident'>last_step_end</span> <span class='op'>=</span> <span class='ident'>e</span>;
                    <span class='ident'>SearchStep</span>::<span class='ident'>Match</span>(<span class='ident'>s</span>, <span class='ident'>e</span>)
                } <span class='kw'>else</span> {
                    <span class='self'>self</span>.<span class='ident'>next_match</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>((<span class='ident'>s</span>, <span class='ident'>e</span>));
                    <span class='kw'>let</span> <span class='ident'>last</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>last_step_end</span>;
                    <span class='self'>self</span>.<span class='ident'>last_step_end</span> <span class='op'>=</span> <span class='ident'>s</span>;
                    <span class='ident'>SearchStep</span>::<span class='ident'>Reject</span>(<span class='ident'>last</span>, <span class='ident'>s</span>)
                }
            }
        }
    }
}

<span class='kw'>fn</span> <span class='ident'>exec</span>(<span class='ident'>re</span>: <span class='kw-2'>&amp;</span><span class='ident'>Regex</span>, <span class='ident'>caps</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>CaptureIdxs</span>, <span class='ident'>text</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>start</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
    <span class='kw'>match</span> <span class='op'>*</span><span class='ident'>re</span> {
        <span class='ident'>Regex</span>::<span class='ident'>Native</span>(<span class='ident'>ExNative</span> { <span class='kw-2'>ref</span> <span class='ident'>prog</span>, .. }) <span class='op'>=&gt;</span> (<span class='op'>*</span><span class='ident'>prog</span>)(<span class='ident'>caps</span>, <span class='ident'>text</span>, <span class='ident'>start</span>),
        <span class='ident'>Regex</span>::<span class='ident'>Dynamic</span>(<span class='kw-2'>ref</span> <span class='ident'>prog</span>) <span class='op'>=&gt;</span> <span class='ident'>prog</span>.<span class='ident'>exec</span>(<span class='ident'>caps</span>, <span class='ident'>text</span>, <span class='ident'>start</span>),
    }
}
</pre>
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