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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 a regex matcher that composes several other regex matchers automatically."><title>regex_automata::meta - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.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="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../regex_automata/index.html">regex_automata</a><span class="version">0.4.7</span></h2></div><h2 class="location"><a href="#">Module meta</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 crate regex_automata</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">regex_automata</a>::<wbr><a class="mod" href="#">meta</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/regex_automata/meta/mod.rs.html#1-62">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 a regex matcher that composes several other regex matchers
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automatically.</p>
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<p>This module is home to a meta <a href="struct.Regex.html" title="struct regex_automata::meta::Regex"><code>Regex</code></a>, which provides a convenient high
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level API for executing regular expressions in linear time.</p>
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<h2 id="comparison-with-the-regex-crate"><a class="doc-anchor" href="#comparison-with-the-regex-crate">§</a>Comparison with the <code>regex</code> crate</h2>
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<p>A meta <code>Regex</code> is the implementation used directly by the <code>regex</code> crate.
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Indeed, the <code>regex</code> crate API is essentially just a light wrapper over a meta
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<code>Regex</code>. This means that if you need the full flexibility offered by this
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API, then you should be able to switch to using this API directly without
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any changes in match semantics or syntax. However, there are some API level
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differences:</p>
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<ul>
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<li>The <code>regex</code> crate API returns match objects that include references to the
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haystack itself, which in turn makes it easy to access the matching strings
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without having to slice the haystack yourself. In contrast, a meta <code>Regex</code>
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returns match objects that only have offsets in them.</li>
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<li>At time of writing, a meta <code>Regex</code> doesn’t have some of the convenience
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routines that the <code>regex</code> crate has, such as replacements. Note though that
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<a href="../util/captures/struct.Captures.html#method.interpolate_string" title="method regex_automata::util::captures::Captures::interpolate_string"><code>Captures::interpolate_string</code></a>
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will handle the replacement string interpolation for you.</li>
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<li>A meta <code>Regex</code> supports the <a href="../struct.Input.html" title="struct regex_automata::Input"><code>Input</code></a> abstraction, which
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provides a way to configure a search in more ways than is supported by the
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<code>regex</code> crate. For example, <a href="../struct.Input.html#method.anchored" title="method regex_automata::Input::anchored"><code>Input::anchored</code></a> can
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be used to run an anchored search, regardless of whether the pattern is itself
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anchored with a <code>^</code>.</li>
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<li>A meta <code>Regex</code> supports multi-pattern searching everywhere.
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Indeed, every <a href="../struct.Match.html" title="struct regex_automata::Match"><code>Match</code></a> returned by the search APIs
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include a <a href="../struct.PatternID.html" title="struct regex_automata::PatternID"><code>PatternID</code></a> indicating which pattern
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matched. In the single pattern case, all matches correspond to
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<a href="../struct.PatternID.html#associatedconstant.ZERO" title="associated constant regex_automata::PatternID::ZERO"><code>PatternID::ZERO</code></a>. In contrast, the <code>regex</code> crate
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has distinct <code>Regex</code> and a <code>RegexSet</code> APIs. The former only supports a single
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pattern, while the latter supports multiple patterns but cannot report the
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offsets of a match.</li>
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<li>A meta <code>Regex</code> provides the explicit capability of bypassing its internal
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memory pool for automatically acquiring mutable scratch space required by its
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internal regex engines. Namely, a <a href="struct.Cache.html" title="struct regex_automata::meta::Cache"><code>Cache</code></a> can be explicitly provided to lower
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level routines such as <a href="struct.Regex.html#method.search_with" title="method regex_automata::meta::Regex::search_with"><code>Regex::search_with</code></a>.</li>
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</ul>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.BuildError.html" title="struct regex_automata::meta::BuildError">BuildError</a></div><div class="desc docblock-short">An error that occurs when construction of a <code>Regex</code> fails.</div></li><li><div class="item-name"><a class="struct" href="struct.Builder.html" title="struct regex_automata::meta::Builder">Builder</a></div><div class="desc docblock-short">A builder for configuring and constructing a <code>Regex</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.Cache.html" title="struct regex_automata::meta::Cache">Cache</a></div><div class="desc docblock-short">Represents mutable scratch space used by regex engines during a search.</div></li><li><div class="item-name"><a class="struct" href="struct.CapturesMatches.html" title="struct regex_automata::meta::CapturesMatches">CapturesMatches</a></div><div class="desc docblock-short">An iterator over all non-overlapping leftmost matches with their capturing
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groups.</div></li><li><div class="item-name"><a class="struct" href="struct.Config.html" title="struct regex_automata::meta::Config">Config</a></div><div class="desc docblock-short">An object describing the configuration of a <code>Regex</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.FindMatches.html" title="struct regex_automata::meta::FindMatches">FindMatches</a></div><div class="desc docblock-short">An iterator over all non-overlapping matches.</div></li><li><div class="item-name"><a class="struct" href="struct.Regex.html" title="struct regex_automata::meta::Regex">Regex</a></div><div class="desc docblock-short">A regex matcher that works by composing several other regex matchers
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automatically.</div></li><li><div class="item-name"><a class="struct" href="struct.Split.html" title="struct regex_automata::meta::Split">Split</a></div><div class="desc docblock-short">Yields all substrings delimited by a regular expression match.</div></li><li><div class="item-name"><a class="struct" href="struct.SplitN.html" title="struct regex_automata::meta::SplitN">SplitN</a></div><div class="desc docblock-short">Yields at most <code>N</code> spans delimited by a regular expression match.</div></li></ul></section></div></main></body></html> |