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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Provides types for dealing with capturing groups."><title>regex_automata::util::captures - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="regex_automata" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../regex_automata/index.html">regex_automata</a><span class="version">0.4.5</span></h2></div><h2 class="location"><a href="#">Module captures</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li></ul></section><h2><a href="../index.html">In regex_automata::util</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../regex_automata/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../../index.html">regex_automata</a>::<wbr><a href="../index.html">util</a>::<wbr><a class="mod" href="#">captures</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/regex_automata/util/captures.rs.html#1-2548">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Provides types for dealing with capturing groups.</p>
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<p>Capturing groups refer to sub-patterns of regexes that some regex engines can
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report matching offsets for. For example, matching <code>[a-z]([0-9]+)</code> against
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<code>a789</code> would give <code>a789</code> as the overall match (for the implicit capturing group
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at index <code>0</code>) and <code>789</code> as the match for the capturing group <code>([0-9]+)</code> (an
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explicit capturing group at index <code>1</code>).</p>
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<p>Not all regex engines can report match offsets for capturing groups. Indeed,
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to a first approximation, regex engines that can report capturing group offsets
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tend to be quite a bit slower than regex engines that can’t. This is because
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tracking capturing groups at search time usually requires more “power” that
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in turn adds overhead.</p>
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<p>Other regex implementations might call capturing groups “submatches.”</p>
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<h2 id="overview"><a href="#overview">Overview</a></h2>
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<p>The main types in this module are:</p>
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<ul>
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<li><a href="struct.Captures.html" title="struct regex_automata::util::captures::Captures"><code>Captures</code></a> records the capturing group offsets found during a search. It
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provides convenience routines for looking up capturing group offsets by either
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index or name.</li>
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<li><a href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo"><code>GroupInfo</code></a> records the mapping between capturing groups and “slots,”
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where the latter are how capturing groups are recorded during a regex search.
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This also keeps a mapping from capturing group name to index, and capture
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group index to name. A <code>GroupInfo</code> is used by <code>Captures</code> internally to
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provide a convenient API. It is unlikely that you’ll use a <code>GroupInfo</code>
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directly, but for example, if you’ve compiled an Thompson NFA, then you can use
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<a href="../../nfa/thompson/struct.NFA.html#method.group_info" title="method regex_automata::nfa::thompson::NFA::group_info"><code>thompson::NFA::group_info</code></a> to get its
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underlying <code>GroupInfo</code>.</li>
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</ul>
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</div></details><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Captures.html" title="struct regex_automata::util::captures::Captures">Captures</a></div><div class="desc docblock-short">The span offsets of capturing groups after a match has been found.</div></li><li><div class="item-name"><a class="struct" href="struct.CapturesPatternIter.html" title="struct regex_automata::util::captures::CapturesPatternIter">CapturesPatternIter</a></div><div class="desc docblock-short">An iterator over all capturing groups in a <code>Captures</code> value.</div></li><li><div class="item-name"><a class="struct" href="struct.GroupInfo.html" title="struct regex_automata::util::captures::GroupInfo">GroupInfo</a></div><div class="desc docblock-short">Represents information about capturing groups in a compiled regex.</div></li><li><div class="item-name"><a class="struct" href="struct.GroupInfoAllNames.html" title="struct regex_automata::util::captures::GroupInfoAllNames">GroupInfoAllNames</a></div><div class="desc docblock-short">An iterator over capturing groups and their names for a <code>GroupInfo</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.GroupInfoError.html" title="struct regex_automata::util::captures::GroupInfoError">GroupInfoError</a></div><div class="desc docblock-short">An error that may occur when building a <code>GroupInfo</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.GroupInfoPatternNames.html" title="struct regex_automata::util::captures::GroupInfoPatternNames">GroupInfoPatternNames</a></div><div class="desc docblock-short">An iterator over capturing groups and their names for a specific pattern.</div></li></ul></section></div></main></body></html>
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