<!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="A builder for a regex based on a hybrid NFA/DFA."><title>Builder in regex_automata::hybrid::regex - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><linkrel="stylesheet"href="../../../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><metaname="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"><scriptsrc="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../../../static.files/main-305769736d49e732.js"></script><noscript><linkrel="stylesheet"href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><linkrel="alternate icon"type="image/png"href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><linkrel="alternate icon"type="image/png"href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../../../static.files/favicon-2c020d218678b618.svg"></head><bodyclass="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle">☰</button></nav><navclass="sidebar"><divclass="sidebar-crate"><h2><ahref="../../../regex_automata/index.html">regex_automata</a><spanclass="version">0.4.6</span></h2></div><h2class="location"><ahref="#">Builder</a></h2><divclass="sidebar-elems"><section><h3><ahref="#implementations">Methods</a></h3><ulclass="block method"><li><ahref="#method.build">build</a></li><li><ahref="#method.build_from_dfas">build_from_dfas</a></li><li><ahref="#method.build_many">build_many</a></li><li><ahref="#method.dfa">dfa</a></li><li><ahref="#method.new">new</a></li><li><ahref="#method.syntax">syntax</a></li><li><ahref="#method.thompson">thompson</a></li></ul><h3><ahref="#trait-implementations">Trait Implementations</a></h3><ulclass="block trait-implementation"><li><ahref="#impl-Clone-for-Builder">Clone</a></li><li><ahref="#impl-Debug-for-Builder">Debug</a></li><li><ahref="#impl-Default-for-Builder">Default</a></li></ul><h3><ahref="#synthetic-implementations">Auto Trait Implementations</a></h3><ulclass="block synthetic-implementation"><li><ahref="#impl-RefUnwindSafe-for-Builder">!RefUnwindSafe</a></li><li><ahref="#impl-Sync-for-Builder">!Sync</a></li><li><ahref="#impl-Send-for-Builder">Send</a></li><li><ahref="#impl-Unpin-for-Builder">Unpin</a></li><li><ahref="#impl-UnwindSafe-for-Builder">UnwindSafe</a></li></ul><h3><ahref="#blanket-implementations">Blanket Implementations</a></h3><ulclass="block blanket-implementation"><li><ahref="#impl-Any-for-T">Any</a></li><li><ahref="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><ahref="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><ahref="#impl-From%3CT%3E-for-T">From<T></a></li><li><ahref="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><
<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../../../regex_automata/all.html"title="show sidebar"></a></div><inputclass="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"><divid="help-button"tabindex="-1"><ahref="../../../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../../../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Struct <ahref="../../index.html">regex_automata</a>::<wbr><ahref="../index.html">hybrid</a>::<wbr><ahref="index.html">regex</a>::<wbr><aclass="struct"href="#">Builder</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../../../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../../../src/regex_automata/hybrid/regex.rs.html#767-769">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><preclass="rust item-decl"><code>pub struct Builder { <spanclass="comment">/* private fields */</span> }</code></pre><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>A builder for a regex based on a hybrid NFA/DFA.</p>
<p>This builder permits configuring options for the syntax of a pattern, the
NFA construction, the lazy DFA construction and finally the regex searching
itself. This builder is different from a general purpose regex builder
in that it permits fine grain configuration of the construction process.
The trade off for this is complexity, and the possibility of setting a
configuration that might not make sense. For example, there are two
whether the pattern itself can contain sub-expressions that match invalid
UTF-8.</li>
<li><ahref="../../nfa/thompson/struct.Config.html#method.utf8"title="method regex_automata::nfa::thompson::Config::utf8"><code>thompson::Config::utf8</code></a> controls how the regex iterators themselves
advance the starting position of the next search when a match with zero
length is found.</li>
</ul>
<p>Generally speaking, callers will want to either enable all of these or
disable all of these.</p>
<p>Internally, building a regex requires building two hybrid NFA/DFAs,
where one is responsible for finding the end of a match and the other is
responsible for finding the start of a match. If you only need to detect
whether something matched, or only the end of a match, then you should use
a <ahref="../dfa/struct.Builder.html"title="struct regex_automata::hybrid::dfa::Builder"><code>dfa::Builder</code></a> to construct a single hybrid NFA/DFA, which is cheaper
</div></details><h2id="implementations"class="section-header">Implementations<ahref="#implementations"class="anchor">§</a></h2><divid="implementations-list"><detailsclass="toggle implementors-toggle"open><summary><sectionid="impl-Builder"class="impl"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#771-889">source</a><ahref="#impl-Builder"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Builder.html"title="struct regex_automata::hybrid::regex::Builder">Builder</a></h3></section></summary><divclass="impl-items"><detailsclass="toggle method-toggle"open><summary><sectionid="method.new"class="method"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#773-775">source</a><h4class="code-header">pub fn <ahref="#method.new"class="fn">new</a>() -><aclass="struct"href="struct.Builder.html"title="struct regex_automata::hybrid::regex::Builder">Builder</a></h4></section></summary><divclass="docblock"><p>Create a new regex builder with the default configuration.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.build"class="method"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#782-784">source</a><h4class="code-header">pub fn <ahref="#method.build"class="fn">build</a>(&self, pattern: &<aclass="primitive"href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="struct"href="struct.Regex.html"title="struct regex_automata::hybrid::regex::Regex">Regex</a>, <aclass="struct"href="../struct.BuildError.html"title="struct regex_automata::hybrid::BuildError">BuildError</a>></h4></section></summary><divclass="docblock"><p>Build a regex from the given pattern.</p>
<p>If there was a problem parsing or compiling the pattern, then an error
) -><aclass="enum"href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="struct"href="struct.Regex.html"title="struct regex_automata::hybrid::regex::Regex">Regex</a>, <aclass="struct"href="../struct.BuildError.html"title="struct regex_automata::hybrid::BuildError">BuildError</a>></h4></section></summary><divclass="docblock"><p>Build a regex from the given patterns.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.build_from_dfas"class="method"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#851-853">source</a><h4class="code-header">pub fn <ahref="#method.build_from_dfas"class="fn">build_from_dfas</a>(&self, forward: <aclass="struct"href="../dfa/struct.DFA.html"title="struct regex_automata::hybrid::dfa::DFA">DFA</a>, reverse: <aclass="struct"href="../dfa/struct.DFA.html"title="struct regex_automata::hybrid::dfa::DFA">DFA</a>) -><aclass="struct"href="struct.Regex.html"title="struct regex_automata::hybrid::regex::Regex">Regex</a></h4></section></summary><divclass="docblock"><p>Build a regex from its component forward and reverse hybrid NFA/DFAs.</p>
<p>This is useful when you’ve built a forward and reverse lazy DFA
separately, and want to combine them into a single regex. Once build,
the individual DFAs given can still be accessed via <ahref="struct.Regex.html#method.forward"title="method regex_automata::hybrid::regex::Regex::forward"><code>Regex::forward</code></a>
and <ahref="struct.Regex.html#method.reverse"title="method regex_automata::hybrid::regex::Regex::reverse"><code>Regex::reverse</code></a>.</p>
<p>It is important that the reverse lazy DFA be compiled under the
following conditions:</p>
<ul>
<li>It should use <ahref="../../enum.MatchKind.html#variant.All"title="variant regex_automata::MatchKind::All"><code>MatchKind::All</code></a> semantics.</li>
<li>It should match in reverse.</li>
<li>Otherwise, its configuration should match the forward DFA.</li>
</ul>
<p>If these conditions aren’t satisfied, then the behavior of searches is
unspecified.</p>
<p>Note that when using this constructor, no configuration is applied.
Since this routine provides the DFAs to the builder, there is no
opportunity to apply other configuration options.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.syntax"class="method"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#861-867">source</a><h4class="code-header">pub fn <ahref="#method.syntax"class="fn">syntax</a>(&mut self, config: <aclass="struct"href="../../util/syntax/struct.Config.html"title="struct regex_automata::util::syntax::Config">Config</a>) ->&mut <aclass="struct"href="struct.Builder.html"title="struct regex_automata::hybrid::regex::Builder">Builder</a></h4></section></summary><divclass="docblock"><p>Set the syntax configuration for this builder using
<p>This permits setting things like case insensitivity, Unicode and multi
line mode.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.thompson"class="method"><aclass="src rightside"href="../../../src/regex_automata/hybrid/regex.rs.html#875-878">source</a><h4class="code-header">pub fn <ahref="#method.thompson"class="fn">thompson</a>(&mut self, config: <aclass="struct"href="../../nfa/thompson/struct.Config.html"title="struct regex_automata::nfa::thompson::Config">Config</a>) ->&mut <aclass="struct"href="struct.Builder.html"title="struct regex_automata::hybrid::regex::Builder">Builder</a></h4></section></summary><divclass="docblock"><p>Set the Thompson NFA configuration for this builder using
<p>That is, this conversion is whatever the implementation of
<code><ahref="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-ToOwned-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#83-85">source</a><ahref="#impl-ToOwned-for-T"class="anchor">§</a><h3class="code-header">impl<T><aclass="trait"href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html"title="trait alloc::borrow::ToOwned">ToOwned</a> for T<divclass="where">where
T: <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html"title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Owned"class="associatedtype trait-impl"><ahref="#associatedtype.Owned"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned"class="associatedtype">Owned</a> = T</h4></section></summary><divclass='docblock'>The resulting type after obtaining ownership.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.to_owned"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#88">source</a><ahref="#method.to_owned"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned"class="fn">to_owned</a>(&self) -> T</h4></section></summary><divclass='docblock'>Creates owned data from borrowed data, usually by cloning. <ahref="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.clone_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/alloc/borrow.rs.html#92">source</a><ahref="#method.clone_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#method.clone_into"class="fn">clone_into</a>(&self, target: <aclass="primitive"href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut T</a>)</h4></section></summary><divclass='docblock'>Uses borrowed data to replace owned data, usually by cloning. <ahref="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryFrom%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#803-805">source</a><ahref="#impl-TryFrom%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error"class="associatedtype trait-impl"><ahref="#associatedtype.Error"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/1.76.0/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_from"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#810">source</a><ahref="#method.try_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from"class="fn">try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details><detailsclass="toggle implementors-toggle"><summary><sectionid="impl-TryInto%3CU%3E-for-T"class="impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#788-790">source</a><ahref="#impl-TryInto%3CU%3E-for-T"class="anchor">§</a><h3class="code-header">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T<divclass="where">where
U: <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><divclass="impl-items"><detailsclass="toggle"open><summary><sectionid="associatedtype.Error-1"class="associatedtype trait-impl"><ahref="#associatedtype.Error-1"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><divclass='docblock'>The type returned in the event of a conversion error.</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.try_into"class="method trait-impl"><aclass="src rightside"href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#795">source</a><ahref="#method.try_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into"class="fn">try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><divclass='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
