<!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 configuring and constructing a `Regex`."><title>Builder in regex_automata::meta - 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-5bc39a1768837dd0.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="1.77.0 (aedd173a2 2024-03-17)"data-channel="1.77.0"data-search-js="search-dd67cee4cfa65049.js"data-settings-js="settings-4313503d2e1961c2.js"><scriptsrc="../../static.files/storage-4c98445ec4002617.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../../static.files/main-48f368f3872407c8.js"></script><noscript><linkrel="stylesheet"href="../../static.files/noscript-04d5337699b92874.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"title="show sidebar"></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_hir">build_from_hir</a></li><li><ahref="#method.build_many">build_many</a></li><li><ahref="#method.build_many_from_hir">build_many_from_hir</a></li><li><ahref="#method.configure">configure</a></li><li><ahref="#method.new">new</a></li><li><ahref="#method.syntax">syntax</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></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-Send-for-Builder">Send</a></li><li><ahref="#impl-Sync-for-Builder">Sync</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><ahref="#impl-ToOwned-for-T">ToOwned</a></li><li><ahref="#impl-
<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">meta</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/meta/regex.rs.html#3323-3327">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 configuring and constructing a <code>Regex</code>.</p>
<p>The builder permits configuring two different aspects of a <code>Regex</code>:</p>
<ul>
<li><ahref="struct.Builder.html#method.configure"title="method regex_automata::meta::Builder::configure"><code>Builder::configure</code></a> will set high-level configuration options as
described by a <ahref="struct.Config.html"title="struct regex_automata::meta::Config"><code>Config</code></a>.</li>
<li><ahref="struct.Builder.html#method.syntax"title="method regex_automata::meta::Builder::syntax"><code>Builder::syntax</code></a> will set the syntax level configuration options
as described by a <ahref="../util/syntax/struct.Config.html"title="struct regex_automata::util::syntax::Config"><code>util::syntax::Config</code></a>.
This only applies when building a <code>Regex</code> from pattern strings.</li>
</ul>
<p>Once configured, the builder can then be used to construct a <code>Regex</code> from
one of 4 different inputs:</p>
<ul>
<li><ahref="struct.Builder.html#method.build"title="method regex_automata::meta::Builder::build"><code>Builder::build</code></a> creates a regex from a single pattern string.</li>
<li><ahref="struct.Builder.html#method.build_many"title="method regex_automata::meta::Builder::build_many"><code>Builder::build_many</code></a> creates a regex from many pattern strings.</li>
<li><ahref="struct.Builder.html#method.build_from_hir"title="method regex_automata::meta::Builder::build_from_hir"><code>Builder::build_from_hir</code></a> creates a regex from a
<li><ahref="struct.Builder.html#method.build_many_from_hir"title="method regex_automata::meta::Builder::build_many_from_hir"><code>Builder::build_many_from_hir</code></a> creates a regex from many
<p>The latter two methods in particular provide a way to construct a fully
feature regular expression matcher directly from an <code>Hir</code> expression
without having to first convert it to a string. (This is in contrast to the
top-level <code>regex</code> crate which intentionally provides no such API in order
to avoid making <code>regex-syntax</code> a public dependency.)</p>
<p>As a convenience, this builder may be created via <ahref="struct.Regex.html#method.builder"title="associated function regex_automata::meta::Regex::builder"><code>Regex::builder</code></a>, which
<h2id="example-change-the-line-terminator"><aclass="doc-anchor"href="#example-change-the-line-terminator">§</a>Example: change the line terminator</h2>
</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/meta/regex.rs.html#3329-3634">source</a><ahref="#impl-Builder"class="anchor">§</a><h3class="code-header">impl <aclass="struct"href="struct.Builder.html"title="struct regex_automata::meta::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/meta/regex.rs.html#3331-3337">source</a><h4class="code-header">pub fn <ahref="#method.new"class="fn">new</a>() -><aclass="struct"href="struct.Builder.html"title="struct regex_automata::meta::Builder">Builder</a></h4></section></summary><divclass="docblock"><p>Creates a new builder for configuring and constructing a <ahref="struct.Regex.html"title="struct regex_automata::meta::Regex"><code>Regex</code></a>.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.build"class="method"><aclass="src rightside"href="../../src/regex_automata/meta/regex.rs.html#3359-3361">source</a><h4class="code-header">pub fn <ahref="#method.build"class="fn">build</a>(&self, pattern: &<aclass="primitive"href="https://doc.rust-lang.org/1.77.0/std/primitive.str.html">str</a>) -><aclass="enum"href="https://doc.rust-lang.org/1.77.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="struct"href="struct.Regex.html"title="struct regex_automata::meta::Regex">Regex</a>, <aclass="struct"href="struct.BuildError.html"title="struct regex_automata::meta::BuildError">BuildError</a>></h4></section></summary><divclass="docblock"><p>Builds a <code>Regex</code> from a single pattern string.</p>
) -><aclass="enum"href="https://doc.rust-lang.org/1.77.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="struct"href="struct.Regex.html"title="struct regex_automata::meta::Regex">Regex</a>, <aclass="struct"href="struct.BuildError.html"title="struct regex_automata::meta::BuildError">BuildError</a>></h4></section></summary><divclass="docblock"><p>Builds a <code>Regex</code> from many pattern strings.</p>
<h5id="example-finding-the-pattern-that-caused-an-error"><aclass="doc-anchor"href="#example-finding-the-pattern-that-caused-an-error">§</a>Example: finding the pattern that caused an error</h5>
<p>This is useful if you needed to parse a pattern string into an <code>Hir</code>
for other reasons (such as analysis or transformations). This routine
permits building a <code>Regex</code> directly from the <code>Hir</code> expression instead
of first converting the <code>Hir</code> back to a pattern string.</p>
<p>When using this method, any options set via <ahref="struct.Builder.html#method.syntax"title="method regex_automata::meta::Builder::syntax"><code>Builder::syntax</code></a> are
ignored. Namely, the syntax options only apply when parsing a pattern
string, which isn’t relevant here.</p>
<p>If there was a problem building the underlying regex matcher for the
given <code>Hir</code>, then an error is returned.</p>
) -><aclass="enum"href="https://doc.rust-lang.org/1.77.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="struct"href="struct.Regex.html"title="struct regex_automata::meta::Regex">Regex</a>, <aclass="struct"href="struct.BuildError.html"title="struct regex_automata::meta::BuildError">BuildError</a>></h4></section></summary><divclass="docblock"><p>Builds a <code>Regex</code> directly from many <code>Hir</code> expressions.</p>
<p>This is useful if you needed to parse pattern strings into <code>Hir</code>
expressions for other reasons (such as analysis or transformations).
This routine permits building a <code>Regex</code> directly from the <code>Hir</code>
expressions instead of first converting the <code>Hir</code> expressions back to
pattern strings.</p>
<p>When using this method, any options set via <ahref="struct.Builder.html#method.syntax"title="method regex_automata::meta::Builder::syntax"><code>Builder::syntax</code></a> are
ignored. Namely, the syntax options only apply when parsing a pattern
string, which isn’t relevant here.</p>
<p>If there was a problem building the underlying regex matcher for the
given <code>Hir</code> expressions, then an error is returned.</p>
<p>Note that unlike <ahref="struct.Builder.html#method.build_many"title="method regex_automata::meta::Builder::build_many"><code>Builder::build_many</code></a>, this can only fail as a
result of building the underlying matcher. In that case, there is
no single <code>Hir</code> expression that can be isolated as a reason for the
failure. So if this routine fails, it’s not possible to determine which
<code>Hir</code> expression caused the failure.</p>
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="method.syntax"class="method"><aclass="src rightside"href="../../src/regex_automata/meta/regex.rs.html#3626-3633">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::meta::Builder">Builder</a></h4></section></summary><divclass="docblock"><p>Configure the syntax options when parsing a pattern string while
building a <code>Regex</code>.</p>
<p>These options <em>only</em> apply when <ahref="struct.Builder.html#method.build"title="method regex_automata::meta::Builder::build"><code>Builder::build</code></a> or <ahref="struct.Builder.html#method.build_many"title="method regex_automata::meta::Builder::build_many"><code>Builder::build_many</code></a>
are used. The other build methods accept <code>Hir</code> values, which have
<code><ahref="https://doc.rust-lang.org/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/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/1.77.0/alloc/borrow/trait.ToOwned.html#method.clone_into"class="fn">clone_into</a>(&self, target: <aclass="primitive"href="https://doc.rust-lang.org/1.77.0/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/1.77.0/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/1.77.0/src/core/convert/mod.rs.html#804-806">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/1.77.0/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/1.77.0/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-1"class="associatedtype trait-impl"><ahref="#associatedtype.Error-1"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/1.77.0/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/1.77.0/src/core/convert/mod.rs.html#811">source</a><ahref="#method.try_from"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryFrom.html#tymethod.try_from"class="fn">try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/1.77.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.0/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/1.77.0/src/core/convert/mod.rs.html#789-791">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/1.77.0/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/1.77.0/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"class="associatedtype trait-impl"><ahref="#associatedtype.Error"class="anchor">§</a><h4class="code-header">type <ahref="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.0/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/1.77.0/src/core/convert/mod.rs.html#796">source</a><ahref="#method.try_into"class="anchor">§</a><h4class="code-header">fn <ahref="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryInto.html#tymethod.try_into"class="fn">try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.0/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/1.77.0/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/1.77.0/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>
