<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `Captures` struct in crate `regex`."><metaname="keywords"content="rust, rustlang, rust-lang, Captures"><title>regex::Captures - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../regex/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Struct Captures</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.expand">expand</a><ahref="#method.get">get</a><ahref="#method.iter">iter</a><ahref="#method.len">len</a><ahref="#method.name">name</a></div><aclass="sidebar-title"href="#implementations">Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Debug">Debug</a><ahref="#impl-Index%3C%26%27i%20str%3E">Index<&'i str></a><ahref="#impl-Index%3Cusize%3E">Index<usize></a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-RefUnwindSafe">RefUnwindSafe</a><ahref="#impl-Send">Send</a><ahref="#impl-Sync">Sync</a><ahref="#impl-Unpin">Unpin</a><ahref="#impl-UnwindSafe">UnwindSafe</a></div><aclass="sidebar-title"href="#blanket-implementations">Blanket Implementations</a><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Into%3CU%3E">Into<U></a><ahref="#impl-TryFrom%3CU%3E">TryFrom<U></a><ahref="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><pclass='location'><ahref='index.html'>regex</a></p><script>window.sidebarCurrent={name:'Captures',ty:'struct',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/regex/re_unicode.rs.html#882-886'title='goto source code'>[src]</a></span><spanclass='in-band'>Struct <ahref='index.html'>regex</a>::<wbr><aclass="struct"href=''>Captures</a></span></h1><divclass="docblock type-decl hidden-by-usual-hider"><preclass='rust struct'>pub struct Captures<'t> { /* fields omitted */ }</pre></div><divclass='docblock'><p>Captures rep
<p>The 0th capture always corresponds to the entire match. Each subsequent
index corresponds to the next capture group in the regex. If a capture
group is named, then the matched string is <em>also</em> available via the <code>name</code>
method. (Note that the 0th capture is always unnamed and so must be
accessed with the <code>get</code> method.)</p>
<p>Positions returned from a capture group are always byte indices.</p>
<p><code>'t</code> is the lifetime of the matched text.</p>
</div><h2id='methods'class='small-section-header'>Methods<ahref='#methods'class='anchor'></a></h2><h3id='impl'class='impl'><codeclass='in-band'>impl<'t><aclass="struct"href="../regex/struct.Captures.html"title="struct regex::Captures">Captures</a><'t></code><ahref='#impl'class='anchor'></a><aclass='srclink'href='../src/regex/re_unicode.rs.html#888-955'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.get'class="method"><codeid='get.v'>pub fn <ahref='#method.get'class='fnname'>get</a>(&self, i: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../regex/struct.Match.html"title="struct regex::Match">Match</a><'t>></code><aclass='srclink'href='../src/regex/re_unicode.rs.html#908-910'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns the match associated with the capture group at index <code>i</code>. If
<code>i</code> does not correspond to a capture group, or if the capture group
did not participate in the match, then <code>None</code> is returned.</p>
</div><h4id='method.name'class="method"><codeid='name.v'>pub fn <ahref='#method.name'class='fnname'>name</a>(&self, name: &<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../regex/struct.Match.html"title="struct regex::Match">Match</a><'t>></code><aclass='srclink'href='../src/regex/re_unicode.rs.html#914-916'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns the match for the capture group named <code>name</code>. If <code>name</code> isn't a
valid capture group or didn't match anything, then <code>None</code> is returned.</p>
</div><h4id='method.iter'class="method"><divclass="important-traits"><divclass='tooltip'>ⓘ<spanclass='tooltiptext'>Important traits for <aclass="struct"href="../regex/struct.SubCaptureMatches.html"title="struct regex::SubCaptureMatches">SubCaptureMatches</a><'c, 't></span></div><divclass="content hidden"><h3class="important">Important traits for <aclass="struct"href="../regex/struct.SubCaptureMatches.html"title="struct regex::SubCaptureMatches">SubCaptureMatches</a><'c, 't></h3><codeclass="content"><spanclass="where fmt-newline">impl<'c, 't><aclass="trait"href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html"title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <aclass="struct"href="../regex/struct.SubCaptureMatches.html"title="struct regex::SubCaptureMatches">SubCaptureMatches</a><'c, 't></span><spanclass="where fmt-newline"> type <ahref='https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item'class="type">Item</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../regex/struct.Match.html"title="struct regex::Match">Match</a><'t>>;</span></code></div></div><codeid='iter.v'>pub fn <ahref='#method.iter'class='fnname'>iter</a><'c>(&'c self) -><aclass="struct"href="../regex/struct.SubCaptureMatches.html"title="struct regex::SubCaptureMatches">SubCaptureMatches</a><'c, 't></code><aclass='srclink'href='../src/regex/re_unicode.rs.html#923-925'title='goto source code'>[src]</a></h4><divclass='docblock'><p>An iterator that yields all capturing matches in the order in which
they appear in the regex. If a particular capture group didn't
participate in the match, then <code>None</code> is yielded for that capture.</p>
<p>The first match always corresponds to the overall match of the regex.</p>
</div><h4id='method.expand'class="method"><codeid='expand.v'>pub fn <ahref='#method.expand'class='fnname'>expand</a>(&self, replacement: &<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, dst: &mut <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html"title="struct alloc::string::String">String</a>)</code><aclass='srclink'href='../src/regex/re_unicode.rs.html#943-945'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Expands all instances of <code>$name</code> in <code>replacement</code> to the corresponding
capture group <code>name</code>, and writes them to the <code>dst</code> buffer given.</p>
<p><code>name</code> may be an integer corresponding to the index of the
capture group (counted by order of opening parenthesis where <code>0</code> is the
entire match) or it can be a name (consisting of letters, digits or
underscores) corresponding to a named capture group.</p>
<p>If <code>name</code> isn't a valid capture group (whether the name doesn't exist
or isn't a valid index), then it is replaced with the empty string.</p>
<p>The longest possible name is used. e.g., <code>$1a</code> looks up the capture
group named <code>1a</code> and not the capture group at index <code>1</code>. To exert more
precise control over the name, use braces, e.g., <code>${1}a</code>.</p>
<p>To write a literal <code>$</code> use <code>$$</code>.</p>
</div><h4id='method.len'class="method"><codeid='len.v'>pub fn <ahref='#method.len'class='fnname'>len</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><aclass='srclink'href='../src/regex/re_unicode.rs.html#952-954'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns the number of captured groups.</p>
<p>This is always at least <code>1</code>, since every regex has at least one capture
</div></div><h2id='implementations'class='small-section-header'>Trait Implementations<ahref='#implementations'class='anchor'></a></h2><divid='implementations-list'><h3id='impl-Debug'class='impl'><codeclass='in-band'>impl<'t><aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="../regex/struct.Captures.html"title="struct regex::Captures">Captures</a><'t></code><ahref='#impl-Debug'class='anchor'></a><aclass='srclink'href='../src/regex/re_unicode.rs.html#957-961'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.fmt'class="method hidden"><codeid='fmt.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt'class='fnname'>fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a>) -><aclass="type"href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html"title="type core::fmt::Result">Result</a></code><aclass='srclink'href='../src/regex/re_unicode.rs.html#958-960'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Formats the value using the given formatter. <ahref="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3id='impl-Index%3Cusize%3E'class='impl'><codeclass='in-band'>impl<'t><aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html"title="trait core::ops::index::Index">Index</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> for <aclass="struct"href="../regex/struct.Captures.html"title="struct regex::Captures">Captures</a><'t></code><ahref='#impl-Index%3Cusize%3E'class='anchor'></a><aclass='srclink'href='../src/regex/re_unicode.rs.html#995-1003'title='goto source code'>[src]</a></h3><divclass='docblock'><p>Get a group by index.</p>
</div><divclass='impl-items'><h4id='associatedtype.Output'class="type"><codeid='Output.t'>type <ahref='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output'class="type">Output</a> = <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></h4><divclass='docblock'><p>The returned type after indexing.</p>
</div></div><h3id='impl-Index%3C%26%27i%20str%3E'class='impl'><codeclass='in-band'>impl<'t, 'i><aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html"title="trait core::ops::index::Index">Index</a><&'i <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>> for <aclass="struct"href="../regex/struct.Captures.html"title="struct regex::Captures">Captures</a><'t></code><ahref='#impl-Index%3C%26%27i%20str%3E'class='anchor'></a><aclass='srclink'href='../src/regex/re_unicode.rs.html#1017-1025'title='goto source code'>[src]</a></h3><divclass='docblock'><p>Get a group by name.</p>
<p><code>'t</code> is the lifetime of the matched text and <code>'i</code> is the lifetime
of the group name (the index).</p>
<p>The text can't outlive the <code>Captures</code> object if this method is
used, because of how <code>Index</code> is defined (normally <code>a[i]</code> is part
of <code>a</code> and can't outlive it); to do that, use <code>name</code> instead.</p>
<p>If there is no group named by the given value.</p>
</div><divclass='impl-items'><h4id='associatedtype.Output-1'class="type"><codeid='Output.t-1'>type <ahref='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output'class="type">Output</a> = <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></h4><divclass='docblock'><p>The returned type after indexing.</p>
</div></div><h3id='impl-From%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for T</code><ahref='#impl-From%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#552-554'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.from'class="method hidden"><codeid='from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from'class='fnname'>from</a>(t: T) -> T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#553'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryFrom%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></code><ahref='#impl-TryFrom%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#571-577'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error'class="type"><codeid='Error.t'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error'class="type">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_from'class="method hidden"><codeid='try_from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from'class='fnname'>try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#574-576'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryInto%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><ahref='#impl-TryInto%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#559-566'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error-1'class="type"><codeid='Error.t-1'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error'class="type">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_into'class="method hidden"><codeid='try_into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into'class='fnname'>try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#563-565'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-BorrowMut%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-BorrowMut%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow_mut'class="method hidden"><codeid='borrow_mut.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut'class='fnname'>borrow_mut</a>(&mut self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3id='impl-Borrow%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Borrow%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213-215'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow'class="method hidden"><codeid='borrow.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow'class='fnname'>borrow</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3id='impl-Any'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T <spanclass="where fmt-newline">where<br> T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Any'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#100-102'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.type_id'class="method hidden"><codeid='type_id.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id'class='fnname'>type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#101'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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