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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 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, 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='doccomment'>//! This crate provides a native implementation of regular expressions that is</span>
<span class='doccomment'>//! heavily based on RE2 both in syntax and in implementation. Notably,</span>
<span class='doccomment'>//! backreferences and arbitrary lookahead/lookbehind assertions are not</span>
<span class='doccomment'>//! provided. In return, regular expression searching provided by this package</span>
<span class='doccomment'>//! has excellent worst-case performance. The specific syntax supported is</span>
<span class='doccomment'>//! documented further down.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This crate's documentation provides some simple examples, describes Unicode</span>
<span class='doccomment'>//! support and exhaustively lists the supported syntax. For more specific</span>
<span class='doccomment'>//! details on the API, please see the documentation for the `Regex` type.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Usage</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This crate is [on crates.io](https://crates.io/crates/regex) and can be</span>
<span class='doccomment'>//! used by adding `regex` to your dependencies in your project's `Cargo.toml`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```toml</span>
<span class='doccomment'>//! [dependencies]</span>
<span class='doccomment'>//! regex = "0.1.8"</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! and this to your crate root:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! extern crate regex;</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # First example: find a date</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! General use of regular expressions in this package involves compiling an</span>
<span class='doccomment'>//! expression and then using it to search, split or replace text. For example,</span>
<span class='doccomment'>//! to confirm that some text resembles a date:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! use regex::Regex;</span>
<span class='doccomment'>//! let re = Regex::new(r"^\d{4}-\d{2}-\d{2}$").unwrap();</span>
<span class='doccomment'>//! assert!(re.is_match("2014-01-01"));</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Notice the use of the `^` and `$` anchors. In this crate, every expression</span>
<span class='doccomment'>//! is executed with an implicit `.*?` at the beginning and end, which allows</span>
<span class='doccomment'>//! it to match anywhere in the text. Anchors can be used to ensure that the</span>
<span class='doccomment'>//! full text matches an expression.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This example also demonstrates the utility of</span>
<span class='doccomment'>//! [raw strings](http://doc.rust-lang.org/stable/reference.html#raw-byte-string-literals)</span>
<span class='doccomment'>//! in Rust, which</span>
<span class='doccomment'>//! are just like regular strings except they are prefixed with an `r` and do</span>
<span class='doccomment'>//! not process any escape sequences. For example, `"\\d"` is the same</span>
<span class='doccomment'>//! expression as `r"\d"`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # The `regex!` macro</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Rust's compile-time meta-programming facilities provide a way to write a</span>
<span class='doccomment'>//! `regex!` macro which compiles regular expressions *when your program</span>
<span class='doccomment'>//! compiles*. Said differently, if you only use `regex!` to build regular</span>
<span class='doccomment'>//! expressions in your program, then your program cannot compile with an</span>
<span class='doccomment'>//! invalid regular expression. Moreover, the `regex!` macro compiles the</span>
<span class='doccomment'>//! given expression to native Rust code, which ideally makes it faster.</span>
<span class='doccomment'>//! Unfortunately (or fortunately), the dynamic implementation has had a lot</span>
<span class='doccomment'>//! more optimization work put it into it currently, so it is faster than</span>
<span class='doccomment'>//! the `regex!` macro in most cases.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To use the `regex!` macro, you must enable the `plugin` feature and import</span>
<span class='doccomment'>//! the `regex_macros` crate as a syntax extension:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```ignore</span>
<span class='doccomment'>//! #![feature(plugin)]</span>
<span class='doccomment'>//! #![plugin(regex_macros)]</span>
<span class='doccomment'>//! extern crate regex;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! fn main() {</span>
<span class='doccomment'>//! let re = regex!(r"^\d{4}-\d{2}-\d{2}$");</span>
<span class='doccomment'>//! assert!(re.is_match("2014-01-01"));</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! There are a few things worth mentioning about using the `regex!` macro.</span>
<span class='doccomment'>//! Firstly, the `regex!` macro *only* accepts string *literals*.</span>
<span class='doccomment'>//! Secondly, the `regex` crate *must* be linked with the name `regex` since</span>
<span class='doccomment'>//! the generated code depends on finding symbols in the `regex` crate.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! One downside of using the `regex!` macro is that it can increase the</span>
<span class='doccomment'>//! size of your program's binary since it generates specialized Rust code.</span>
<span class='doccomment'>//! The extra size probably won't be significant for a small number of</span>
<span class='doccomment'>//! expressions, but 100+ calls to `regex!` will probably result in a</span>
<span class='doccomment'>//! noticeably bigger binary.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! **NOTE**: This is implemented using a compiler plugin, which is not</span>
<span class='doccomment'>//! available on the Rust 1.0 beta/stable channels. Therefore, you'll only</span>
<span class='doccomment'>//! be able to use `regex!` on the nightlies.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Example: iterating over capture groups</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This crate provides convenient iterators for matching an expression</span>
<span class='doccomment'>//! repeatedly against a search string to find successive non-overlapping</span>
<span class='doccomment'>//! matches. For example, to find all dates in a string and be able to access</span>
<span class='doccomment'>//! them by their component pieces:</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"(\d{4})-(\d{2})-(\d{2})").unwrap();</span>
<span class='doccomment'>//! let text = "2012-03-14, 2013-01-01 and 2014-07-05";</span>
<span class='doccomment'>//! for cap in re.captures_iter(text) {</span>
<span class='doccomment'>//! println!("Month: {} Day: {} Year: {}",</span>
<span class='doccomment'>//! cap.at(2).unwrap_or(""), cap.at(3).unwrap_or(""),</span>
<span class='doccomment'>//! cap.at(1).unwrap_or(""));</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! // Output:</span>
<span class='doccomment'>//! // Month: 03 Day: 14 Year: 2012</span>
<span class='doccomment'>//! // Month: 01 Day: 01 Year: 2013</span>
<span class='doccomment'>//! // Month: 07 Day: 05 Year: 2014</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Notice that the year is in the capture group indexed at `1`. This is</span>
<span class='doccomment'>//! because the *entire match* is stored in the capture group at index `0`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Example: replacement with named capture groups</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Building on the previous example, perhaps we'd like to rearrange the date</span>
<span class='doccomment'>//! formats. This can be done with text replacement. But to make the code</span>
<span class='doccomment'>//! clearer, we can *name* our capture groups and use those names as variables</span>
<span class='doccomment'>//! in our replacement 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"(?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2})").unwrap();</span>
<span class='doccomment'>//! let before = "2012-03-14, 2013-01-01 and 2014-07-05";</span>
<span class='doccomment'>//! let after = re.replace_all(before, "$m/$d/$y");</span>
<span class='doccomment'>//! assert_eq!(after, "03/14/2012, 01/01/2013 and 07/05/2014");</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The `replace` methods are actually polymorphic in the replacement, which</span>
<span class='doccomment'>//! provides more flexibility than is seen here. (See the documentation for</span>
<span class='doccomment'>//! `Regex::replace` for more details.)</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Note that if your regex gets complicated, you can use the `x` flag to</span>
<span class='doccomment'>//! enable insigificant whitespace mode, which also lets you write comments:</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"(?x)</span>
<span class='doccomment'>//! (?P<y>\d{4}) # the year</span>
<span class='doccomment'>//! -</span>
<span class='doccomment'>//! (?P<m>\d{2}) # the month</span>
<span class='doccomment'>//! -</span>
<span class='doccomment'>//! (?P<d>\d{2}) # the day</span>
<span class='doccomment'>//! ").unwrap();</span>
<span class='doccomment'>//! let before = "2012-03-14, 2013-01-01 and 2014-07-05";</span>
<span class='doccomment'>//! let after = re.replace_all(before, "$m/$d/$y");</span>
<span class='doccomment'>//! assert_eq!(after, "03/14/2012, 01/01/2013 and 07/05/2014");</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Pay for what you use</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! With respect to searching text with a regular expression, there are three</span>
<span class='doccomment'>//! questions that can be asked:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! 1. Does the text match this expression?</span>
<span class='doccomment'>//! 2. If so, where does it match?</span>
<span class='doccomment'>//! 3. Where are the submatches?</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Generally speaking, this crate could provide a function to answer only #3,</span>
<span class='doccomment'>//! which would subsume #1 and #2 automatically. However, it can be</span>
<span class='doccomment'>//! significantly more expensive to compute the location of submatches, so it's</span>
<span class='doccomment'>//! best not to do it if you don't need to.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Therefore, only use what you need. For example, don't use `find` if you</span>
<span class='doccomment'>//! only need to test if an expression matches a string. (Use `is_match`</span>
<span class='doccomment'>//! instead.)</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Unicode</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This implementation executes regular expressions **only** on sequences of</span>
<span class='doccomment'>//! Unicode scalar values while exposing match locations as byte indices into</span>
<span class='doccomment'>//! the search string.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Currently, only simple case folding is supported. Namely, when matching</span>
<span class='doccomment'>//! case-insensitively, the characters are first mapped using the</span>
<span class='doccomment'>//! [simple case folding](ftp://ftp.unicode.org/Public/UNIDATA/CaseFolding.txt)</span>
<span class='doccomment'>//! mapping.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Regular expressions themselves are also **only** interpreted as a sequence</span>
<span class='doccomment'>//! of Unicode scalar values. This means you can use Unicode characters</span>
<span class='doccomment'>//! directly in your expression:</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"(?i)Δ+").unwrap();</span>
<span class='doccomment'>//! assert_eq!(re.find("ΔδΔ"), Some((0, 6)));</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Finally, Unicode general categories and scripts are available as character</span>
<span class='doccomment'>//! classes. For example, you can match a sequence of numerals, Greek or</span>
<span class='doccomment'>//! Cherokee letters:</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"[\pN\p{Greek}\p{Cherokee}]+").unwrap();</span>
<span class='doccomment'>//! assert_eq!(re.find("abcΔᎠβⅠᏴγδⅡxyz"), Some((3, 23)));</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Syntax</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The syntax supported in this crate is almost in an exact correspondence</span>
<span class='doccomment'>//! with the syntax supported by RE2. It is documented below.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Note that the regular expression parser and abstract syntax are exposed in</span>
<span class='doccomment'>//! a separate crate,</span>
<span class='doccomment'>//! [`regex-syntax`](../regex_syntax/index.html).</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Matching one character</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! . any character except new line (includes new line with s flag)</span>
<span class='doccomment'>//! [xyz] A character class matching either x, y or z.</span>
<span class='doccomment'>//! [^xyz] A character class matching any character except x, y and z.</span>
<span class='doccomment'>//! [a-z] A character class matching any character in range a-z.</span>
<span class='doccomment'>//! \d digit (\p{Nd})</span>
<span class='doccomment'>//! \D not digit</span>
<span class='doccomment'>//! [:alpha:] ASCII character class ([A-Za-z])</span>
<span class='doccomment'>//! [:^alpha:] Negated ASCII character class ([^A-Za-z])</span>
<span class='doccomment'>//! \pN One-letter name Unicode character class</span>
<span class='doccomment'>//! \p{Greek} Unicode character class (general category or script)</span>
<span class='doccomment'>//! \PN Negated one-letter name Unicode character class</span>
<span class='doccomment'>//! \P{Greek} negated Unicode character class (general category or script)</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Any named character class may appear inside a bracketed `[...]` character</span>
<span class='doccomment'>//! class. For example, `[\p{Greek}\pN]` matches any Greek or numeral</span>
<span class='doccomment'>//! character.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Composites</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! xy concatenation (x followed by y)</span>
<span class='doccomment'>//! x|y alternation (x or y, prefer x)</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Repetitions</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! x* zero or more of x (greedy)</span>
<span class='doccomment'>//! x+ one or more of x (greedy)</span>
<span class='doccomment'>//! x? zero or one of x (greedy)</span>
<span class='doccomment'>//! x*? zero or more of x (ungreedy)</span>
<span class='doccomment'>//! x+? one or more of x (ungreedy)</span>
<span class='doccomment'>//! x?? zero or one of x (ungreedy)</span>
<span class='doccomment'>//! x{n,m} at least n x and at most m x (greedy)</span>
<span class='doccomment'>//! x{n,} at least n x (greedy)</span>
<span class='doccomment'>//! x{n} exactly n x</span>
<span class='doccomment'>//! x{n,m}? at least n x and at most m x (ungreedy)</span>
<span class='doccomment'>//! x{n,}? at least n x (ungreedy)</span>
<span class='doccomment'>//! x{n}? exactly n x</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Empty matches</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! ^ the beginning of text (or start-of-line with multi-line mode)</span>
<span class='doccomment'>//! $ the end of text (or end-of-line with multi-line mode)</span>
<span class='doccomment'>//! \A only the beginning of text (even with multi-line mode enabled)</span>
<span class='doccomment'>//! \z only the end of text (even with multi-line mode enabled)</span>
<span class='doccomment'>//! \b a Unicode word boundary (\w on one side and \W, \A, or \z on other)</span>
<span class='doccomment'>//! \B not a Unicode word boundary</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Grouping and flags</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! (exp) numbered capture group (indexed by opening parenthesis)</span>
<span class='doccomment'>//! (?P&lt;name&gt;exp) named (also numbered) capture group (allowed chars: [_0-9a-zA-Z])</span>
<span class='doccomment'>//! (?:exp) non-capturing group</span>
<span class='doccomment'>//! (?flags) set flags within current group</span>
<span class='doccomment'>//! (?flags:exp) set flags for exp (non-capturing)</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Flags are each a single character. For example, `(?x)` sets the flag `x`</span>
<span class='doccomment'>//! and `(?-x)` clears the flag `x`. Multiple flags can be set or cleared at</span>
<span class='doccomment'>//! the same time: `(?xy)` sets both the `x` and `y` flags and `(?x-y)` sets</span>
<span class='doccomment'>//! the `x` flag and clears the `y` flag.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! All flags are by default disabled. They are:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! i case-insensitive</span>
<span class='doccomment'>//! m multi-line mode: ^ and $ match begin/end of line</span>
<span class='doccomment'>//! s allow . to match \n</span>
<span class='doccomment'>//! U swap the meaning of x* and x*?</span>
<span class='doccomment'>//! x ignore whitespace and allow line comments (starting with `#`)</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Here's an example that matches case-insensitively for only part of the</span>
<span class='doccomment'>//! expression:</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"(?i)a+(?-i)b+").unwrap();</span>
<span class='doccomment'>//! let cap = re.captures("AaAaAbbBBBb").unwrap();</span>
<span class='doccomment'>//! assert_eq!(cap.at(0), Some("AaAaAbb"));</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Notice that the `a+` matches either `a` or `A`, but the `b+` only matches</span>
<span class='doccomment'>//! `b`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Escape sequences</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! \* literal *, works for any punctuation character: \.+*?()|[]{}^$</span>
<span class='doccomment'>//! \a bell (\x07)</span>
<span class='doccomment'>//! \f form feed (\x0C)</span>
<span class='doccomment'>//! \t horizontal tab</span>
<span class='doccomment'>//! \n new line</span>
<span class='doccomment'>//! \r carriage return</span>
<span class='doccomment'>//! \v vertical tab (\x0B)</span>
<span class='doccomment'>//! \123 octal character code (up to three digits)</span>
<span class='doccomment'>//! \x7F hex character code (exactly two digits)</span>
<span class='doccomment'>//! \x{10FFFF} any hex character code corresponding to a Unicode code point</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## Perl character classes (Unicode friendly)</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! These classes are based on the definitions provided in</span>
<span class='doccomment'>//! [UTS#18](http://www.unicode.org/reports/tr18/#Compatibility_Properties):</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! \d digit (\p{Nd})</span>
<span class='doccomment'>//! \D not digit</span>
<span class='doccomment'>//! \s whitespace (\p{White_Space})</span>
<span class='doccomment'>//! \S not whitespace</span>
<span class='doccomment'>//! \w word character (\p{Alphabetic} + \p{M} + \d + \p{Pc} + \p{Join_Control})</span>
<span class='doccomment'>//! \W not word character</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## ASCII character classes</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! <pre class="rust"></span>
<span class='doccomment'>//! [:alnum:] alphanumeric ([0-9A-Za-z])</span>
<span class='doccomment'>//! [:alpha:] alphabetic ([A-Za-z])</span>
<span class='doccomment'>//! [:ascii:] ASCII ([\x00-\x7F])</span>
<span class='doccomment'>//! [:blank:] blank ([\t ])</span>
<span class='doccomment'>//! [:cntrl:] control ([\x00-\x1F\x7F])</span>
<span class='doccomment'>//! [:digit:] digits ([0-9])</span>
<span class='doccomment'>//! [:graph:] graphical ([!-~])</span>
<span class='doccomment'>//! [:lower:] lower case ([a-z])</span>
<span class='doccomment'>//! [:print:] printable ([ -~])</span>
<span class='doccomment'>//! [:punct:] punctuation ([!-/:-@[-`{-~])</span>
<span class='doccomment'>//! [:space:] whitespace ([\t\n\v\f\r ])</span>
<span class='doccomment'>//! [:upper:] upper case ([A-Z])</span>
<span class='doccomment'>//! [:word:] word characters ([0-9A-Za-z_])</span>
<span class='doccomment'>//! [:xdigit:] hex digit ([0-9A-Fa-f])</span>
<span class='doccomment'>//! </pre></span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Untrusted input</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This crate can handle both untrusted regular expressions and untrusted</span>
<span class='doccomment'>//! search text.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Untrusted regular expressions are handled by capping the size of a compiled</span>
<span class='doccomment'>//! regular expression. (See `Regex::with_size_limit`.) Without this, it would</span>
<span class='doccomment'>//! be trivial for an attacker to exhaust your system's memory with expressions</span>
<span class='doccomment'>//! like `a{100}{100}{100}`.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Untrusted search text is allowed because the matching engine(s) in this</span>
<span class='doccomment'>//! crate have time complexity `O(mn)` (with `m ~ regex` and `n ~ search</span>
<span class='doccomment'>//! text`), which means there's no way to cause exponential blow-up like with</span>
<span class='doccomment'>//! some other regular expression engines. (We pay for this by disallowing</span>
<span class='doccomment'>//! features like arbitrary look-ahead and back-references.)</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</span>)]</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>cfg_attr</span>(<span class='ident'>test</span>, <span class='ident'>deny</span>(<span class='ident'>warnings</span>))]</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>cfg_attr</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"pattern"</span>, <span class='ident'>feature</span>(<span class='ident'>pattern</span>))]</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>doc</span>(<span class='ident'>html_logo_url</span> <span class='op'>=</span> <span class='string'>"http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>,
<span class='ident'>html_favicon_url</span> <span class='op'>=</span> <span class='string'>"http://www.rust-lang.org/favicon.ico"</span>,
<span class='ident'>html_root_url</span> <span class='op'>=</span> <span class='string'>"http://doc.rust-lang.org/regex/"</span>)]</span>
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>aho_corasick</span>;
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>memchr</span>;
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>regex_syntax</span> <span class='kw'>as</span> <span class='ident'>syntax</span>;
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>re</span>::{
<span class='ident'>Regex</span>, <span class='ident'>Error</span>, <span class='ident'>Captures</span>, <span class='ident'>SubCaptures</span>, <span class='ident'>SubCapturesPos</span>, <span class='ident'>SubCapturesNamed</span>,
<span class='ident'>FindCaptures</span>, <span class='ident'>FindMatches</span>,
<span class='ident'>Replacer</span>, <span class='ident'>NoExpand</span>, <span class='ident'>RegexSplits</span>, <span class='ident'>RegexSplitsN</span>,
<span class='ident'>quote</span>, <span class='ident'>is_match</span>,
};
<span class='kw'>mod</span> <span class='ident'>backtrack</span>;
<span class='kw'>mod</span> <span class='ident'>char</span>;
<span class='kw'>mod</span> <span class='ident'>compile</span>;
<span class='kw'>mod</span> <span class='ident'>input</span>;
<span class='kw'>mod</span> <span class='ident'>pool</span>;
<span class='kw'>mod</span> <span class='ident'>prefix</span>;
<span class='kw'>mod</span> <span class='ident'>program</span>;
<span class='kw'>mod</span> <span class='ident'>nfa</span>;
<span class='kw'>mod</span> <span class='ident'>re</span>;
<span class='doccomment'>/// The `internal` module exists to support the `regex!` macro and other</span>
<span class='doccomment'>/// suspicious activity, such as testing different matching engines.</span>
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>internal</span> {
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>char</span>::<span class='ident'>Char</span>;
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>input</span>::{<span class='ident'>Input</span>, <span class='ident'>CharInput</span>, <span class='ident'>InputAt</span>};
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>program</span>::{
<span class='ident'>Program</span>, <span class='ident'>MatchEngine</span>, <span class='ident'>CharRanges</span>, <span class='ident'>Inst</span>, <span class='ident'>LookInst</span>, <span class='ident'>OneChar</span>,
};
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>re</span>::<span class='ident'>ExNative</span>;
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>re</span>::<span class='ident'>Regex</span>::{<span class='ident'>Dynamic</span>, <span class='ident'>Native</span>};
}
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