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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="Defines a high-level intermediate (HIR) representation for regular expressions."><title>regex_syntax::hir - 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_syntax" 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_syntax/index.html">regex_syntax</a><span class="version">0.8.2</span></h2></div><h2 class="location"><a href="#">Module hir</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></section><h2><a href="../index.html">In crate regex_syntax</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_syntax/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_syntax</a>::<wbr><a class="mod" href="#">hir</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_syntax/hir/mod.rs.html#1-3861">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>Defines a high-level intermediate (HIR) representation for regular expressions.</p>
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<p>The HIR is represented by the <a href="struct.Hir.html" title="struct regex_syntax::hir::Hir"><code>Hir</code></a> type, and it principally constructed via
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<a href="translate/index.html" title="mod regex_syntax::hir::translate">translation</a> from an <a href="../ast/enum.Ast.html" title="enum regex_syntax::ast::Ast"><code>Ast</code></a>. Alternatively, users
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may use the smart constructors defined on <code>Hir</code> to build their own by hand. The
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smart constructors simultaneously simplify and “optimize” the HIR, and are also
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the same routines used by translation.</p>
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<p>Most regex engines only have an HIR like this, and usually construct it
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directly from the concrete syntax. This crate however first parses the
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concrete syntax into an <code>Ast</code>, and only then creates the HIR from the <code>Ast</code>,
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as mentioned above. It’s done this way to facilitate better error reporting,
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and to have a structured representation of a regex that faithfully represents
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its concrete syntax. Namely, while an <code>Hir</code> value can be converted back to an
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equivalent regex pattern string, it is unlikely to look like the original due
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to its simplified structure.</p>
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</div></details><h2 id="modules" class="section-header"><a href="#modules">Modules</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="literal/index.html" title="mod regex_syntax::hir::literal">literal</a></div><div class="desc docblock-short">Provides literal extraction from <code>Hir</code> expressions.</div></li><li><div class="item-name"><a class="mod" href="print/index.html" title="mod regex_syntax::hir::print">print</a></div><div class="desc docblock-short">This module provides a regular expression printer for <code>Hir</code>.</div></li><li><div class="item-name"><a class="mod" href="translate/index.html" title="mod regex_syntax::hir::translate">translate</a></div><div class="desc docblock-short">Defines a translator that converts an <code>Ast</code> to an <code>Hir</code>.</div></li></ul><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.Capture.html" title="struct regex_syntax::hir::Capture">Capture</a></div><div class="desc docblock-short">The high-level intermediate representation for a capturing group.</div></li><li><div class="item-name"><a class="struct" href="struct.CaseFoldError.html" title="struct regex_syntax::hir::CaseFoldError">CaseFoldError</a></div><div class="desc docblock-short">An error that occurs when Unicode-aware simple case folding fails.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassBytes.html" title="struct regex_syntax::hir::ClassBytes">ClassBytes</a></div><div class="desc docblock-short">A set of characters represented by arbitrary bytes.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassBytesIter.html" title="struct regex_syntax::hir::ClassBytesIter">ClassBytesIter</a></div><div class="desc docblock-short">An iterator over all ranges in a byte character class.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassBytesRange.html" title="struct regex_syntax::hir::ClassBytesRange">ClassBytesRange</a></div><div class="desc docblock-short">A single range of characters represented by arbitrary bytes.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassUnicode.html" title="struct regex_syntax::hir::ClassUnicode">ClassUnicode</a></div><div class="desc docblock-short">A set of characters represented by Unicode scalar values.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassUnicodeIter.html" title="struct regex_syntax::hir::ClassUnicodeIter">ClassUnicodeIter</a></div><div class="desc docblock-short">An iterator over all ranges in a Unicode character class.</div></li><li><div class="item-name"><a class="struct" href="struct.ClassUnicodeRange.html" title="struct regex_syntax::hir::ClassUnicodeRange">ClassUnicodeRange</a></div><div class="desc docblock-short">A single range of characters represented by Unicode scalar values.</div></li><li><div class="item-name"><a class="struct" href="struct.Error.html" title="struct regex_syntax::hir::Error">Error</a></div><div class="desc docblock-short">An error that can occur while translating an <code>Ast</code> to a <code>Hir</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.Hir.html" title="struct regex_syntax::hir::Hir">Hir</a></div><div class="desc docblock-short">A high-level intermediate representation (HIR) for a regular expression.</div></li><li><div class="item-name"><a class="struct" href="struct.Literal.html" title="struct regex_syntax::hir::Literal">Literal</a></div><div class="desc docblock-short">The high-level intermediate representation of a literal.</div></li><li><div class="item-name"><a class="struct" href="struct.LookSet.html" title="struct regex_syntax::hir::LookSet">LookSet</a></div><div class="desc docblock-short">A set of look-around assertions.</div></li><li><div class="item-name"><a class="struct" href="struct.LookSetIter.html" title="struct regex_syntax::hir::LookSetIter">LookSetIter</a></div><div class="desc docblock-short">An iterator over all look-around assertio
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