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<h1 class='fqn'><span class='in-band'>Enum <a href='index.html'>regex_syntax</a>::<wbr><a class='enum' href=''>Expr</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust enum'>pub enum Expr {
Empty,
Literal {
chars: <a class='struct' href='http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a><<a href='http://doc.rust-lang.org/nightly/std/primitive.char.html'>char</a>>,
casei: <a href='http://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a>,
},
AnyChar,
AnyCharNoNL,
Class(<a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a>),
StartLine,
EndLine,
StartText,
EndText,
WordBoundary,
NotWordBoundary,
Group {
e: <a class='struct' href='http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html' title='alloc::boxed::Box'>Box</a><<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>>,
i: <a class='enum' href='http://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><<a href='http://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>>,
name: <a class='enum' href='http://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><<a class='struct' href='http://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a>>,
},
Repeat {
e: <a class='struct' href='http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html' title='alloc::boxed::Box'>Box</a><<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>>,
r: <a class='enum' href='../regex_syntax/enum.Repeater.html' title='regex_syntax::Repeater'>Repeater</a>,
greedy: <a href='http://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a>,
},
Concat(<a class='struct' href='http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a><<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>>),
Alternate(<a class='struct' href='http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a><<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>>),
}</pre><div class='docblock'><p>A regular expression abstract syntax tree.</p>
<p>An <code>Expr</code> represents the abstract syntax of a regular expression.</p>
</div><h2 class='variants'>Variants</h2>
<table><tr><td id='variant.Empty'><code>Empty</code></td><td><div class='docblock'><p>An empty regex (which never matches any text).</p>
</div></td></tr><tr><td id='variant.Literal'><code>Literal</code></td><td><div class='docblock'><p>A sequence of one or more literal characters to be matched.</p>
</div><h3 class='fields'>Fields</h3>
<table><tr><td id='variant.Literal.field.chars'><code>chars</code></td><td><div class='docblock'><p>The characters.</p>
</div></td></tr><tr><td id='variant.Literal.field.casei'><code>casei</code></td><td><div class='docblock'><p>Whether to match case insensitively.</p>
</div></td></tr></table></td></tr><tr><td id='variant.AnyChar'><code>AnyChar</code></td><td><div class='docblock'><p>Match any character, excluding new line.</p>
</div></td></tr><tr><td id='variant.AnyCharNoNL'><code>AnyCharNoNL</code></td><td><div class='docblock'><p>Match any character.</p>
</div></td></tr><tr><td id='variant.Class'><code>Class</code></td><td><div class='docblock'><p>A character class.</p>
</div></td></tr><tr><td id='variant.StartLine'><code>StartLine</code></td><td><div class='docblock'><p>Match the start of a line or beginning of input.</p>
</div></td></tr><tr><td id='variant.EndLine'><code>EndLine</code></td><td><div class='docblock'><p>Match the end of a line or end of input.</p>
</div></td></tr><tr><td id='variant.StartText'><code>StartText</code></td><td><div class='docblock'><p>Match the beginning of input.</p>
</div></td></tr><tr><td id='variant.EndText'><code>EndText</code></td><td><div class='docblock'><p>Match the end of input.</p>
</div></td></tr><tr><td id='variant.WordBoundary'><code>WordBoundary</code></td><td><div class='docblock'><p>Match a word boundary (word character on one side and a non-word
character on the other).</p>
</div></td></tr><tr><td id='variant.NotWordBoundary'><code>NotWordBoundary</code></td><td><div class='docblock'><p>Match a position that is not a word boundary (word or non-word
characters on both sides).</p>
</div></td></tr><tr><td id='variant.Group'><code>Group</code></td><td><div class='docblock'><p>A group, possibly non-capturing.</p>
</div><h3 class='fields'>Fields</h3>
<table><tr><td id='variant.Group.field.e'><code>e</code></td><td><div class='docblock'><p>The expression inside the group.</p>
</div></td></tr><tr><td id='variant.Group.field.i'><code>i</code></td><td><div class='docblock'><p>The capture index (starting at <code>1</code>) only for capturing groups.</p>
</div></td></tr><tr><td id='variant.Group.field.name'><code>name</code></td><td><div class='docblock'><p>The capture name, only for capturing named groups.</p>
</div></td></tr></table></td></tr><tr><td id='variant.Repeat'><code>Repeat</code></td><td><div class='docblock'><p>A repeat operator (<code>?</code>, <code>*</code>, <code>+</code> or <code>{m,n}</code>).</p>
</div><h3 class='fields'>Fields</h3>
<table><tr><td id='variant.Repeat.field.e'><code>e</code></td><td><div class='docblock'><p>The expression to be repeated. Limited to literals, <code>.</code>, classes
or grouped expressions.</p>
</div></td></tr><tr><td id='variant.Repeat.field.r'><code>r</code></td><td><div class='docblock'><p>The type of repeat operator used.</p>
</div></td></tr><tr><td id='variant.Repeat.field.greedy'><code>greedy</code></td><td><div class='docblock'><p>Whether the repeat is greedy (match the most) or not (match the
least).</p>
</div></td></tr></table></td></tr><tr><td id='variant.Concat'><code>Concat</code></td><td><div class='docblock'><p>A concatenation of expressions. Must be matched one after the other.</p>
<p>N.B. A concat expression can only appear at the top-level or
immediately inside a group expression.</p>
</div></td></tr><tr><td id='variant.Alternate'><code>Alternate</code></td><td><div class='docblock'><p>An alternation of expressions. Only one must match.</p>
<p>N.B. An alternate expression can only appear at the top-level or
immediately inside a group expression.</p>
</div></td></tr></table><h2 id='methods'>Methods</h2><h3 class='impl'><code>impl <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='impl-items'><h4 id='method.parse' class='method'><code>fn <a href='#method.parse' class='fnname'>parse</a>(s: &<a href='http://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>) -> <a class='type' href='../regex_syntax/type.Result.html' title='regex_syntax::Result'>Result</a><<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>></code></h4>
<div class='docblock'><p>Parses a string in a regular expression syntax tree.</p>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><code>impl <a class='trait' href='http://doc.rust-lang.org/nightly/core/fmt/trait.Display.html' title='core::fmt::Display'>Display</a> for <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='docblock'><p>This implementation of <code>Display</code> will write a regular expression from the
syntax tree. It does not write the original string parsed.</p>
</div><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#method.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class='struct' href='http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -> <a class='type' href='http://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
</div><h3 id='derived_implementations'>Derived Implementations </h3><h3 class='impl'><code>impl <a class='trait' href='http://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html' title='core::cmp::Eq'>Eq</a> for <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl <a class='trait' href='http://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a> for <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='impl-items'><h4 id='method.eq' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>) -> <a href='http://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.ne' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a>) -> <a href='http://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='http://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html' title='core::fmt::Debug'>Debug</a> for <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#method.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class='struct' href='http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -> <a class='type' href='http://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='http://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h3><div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone' class='fnname'>clone</a>(&self) -> <a class='enum' href='../regex_syntax/enum.Expr.html' title='regex_syntax::Expr'>Expr</a></code></h4>
<h4 id='method.clone_from' class='method'><code>fn <a href='http://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code></h4>
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