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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="Returns the longest (at least 1) input slice that matches the predicate."><meta name="keywords" content="rust, rustlang, rust-lang, take_while1"><title>take_while1 in nom::bytes::complete - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin 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unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../../nom/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../../nom/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In nom::bytes::complete</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../../nom/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or 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class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn take_while1<F, Input, Error: <a class="trait" href="../../error/trait.ParseError.html" title="trait nom::error::ParseError">ParseError</a><Input>>(<br> cond: F<br>) -> impl <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(Input) -> <a class="type" href="../../type.IResult.html" title="type nom::IResult">IResult</a><Input, Input, Error> <span class="where fmt-newline">where<br> Input: <a class="trait" href="../../trait.InputTakeAtPosition.html" title="trait nom::InputTakeAtPosition">InputTakeAtPosition</a>,<br> F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<Input as <a class="trait" href="../../trait.InputTakeAtPosition.html" title="trait nom::InputTakeAtPosition">InputTakeAtPosition</a>>::<a class="associatedtype" href="../../trait.InputTakeAtPosition.html#associatedtype.Item" title="type nom::InputTakeAtPosition::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.bool.html">bool</a>, </span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returns the longest (at least 1) input slice that matches the predicate.</p>
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<p>The parser will return the longest slice that matches the given predicate <em>(a function that
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takes the input and returns a bool)</em>.</p>
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<p>It will return an <code>Err(Err::Error((_, ErrorKind::TakeWhile1)))</code> if the pattern wasn’t met.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">nom::bytes::complete::take_while1</span>;
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<span class="kw">use</span> <span class="ident">nom::character::is_alphabetic</span>;
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<span class="kw">fn</span> <span class="ident">alpha</span>(<span class="ident">s</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="ident">IResult</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span> {
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<span class="ident">take_while1</span>(<span class="ident">is_alphabetic</span>)(<span class="ident">s</span>)
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}
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<span class="macro">assert_eq!</span>(<span class="ident">alpha</span>(<span class="string">b"latin123"</span>), <span class="prelude-val">Ok</span>((<span class="kw-2">&</span><span class="string">b"123"</span>[..], <span class="kw-2">&</span><span class="string">b"latin"</span>[..])));
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<span class="macro">assert_eq!</span>(<span class="ident">alpha</span>(<span class="string">b"latin"</span>), <span class="prelude-val">Ok</span>((<span class="kw-2">&</span><span class="string">b""</span>[..], <span class="kw-2">&</span><span class="string">b"latin"</span>[..])));
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<span class="macro">assert_eq!</span>(<span class="ident">alpha</span>(<span class="string">b"12345"</span>), <span class="prelude-val">Err</span>(<span class="ident">Err::Error</span>(<span class="ident">Error::new</span>(<span class="kw-2">&</span><span class="string">b"12345"</span>[..], <span class="ident">ErrorKind::TakeWhile1</span>))));</code></pre></div>
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