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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="Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-1.5.6/src/expand.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>expand.rs - source</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 href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[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><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::str</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::find_byte::find_byte</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::re_bytes</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::re_unicode</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expand_str</span>(
<span class="ident">caps</span>: <span class="kw-2">&</span><span class="ident">re_unicode::Captures</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>,
<span class="kw-2">mut</span> <span class="ident">replacement</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">dst</span>: <span class="kw-2">&mut</span> <span class="ident">String</span>,
) {
<span class="kw">while</span> <span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>() {
<span class="kw">match</span> <span class="ident">find_byte</span>(<span class="string">b'$'</span>, <span class="ident">replacement</span>.<span class="ident">as_bytes</span>()) {
<span class="prelude-val">None</span> => <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="ident">i</span>) => {
<span class="ident">dst</span>.<span class="ident">push_str</span>(<span class="kw-2">&</span><span class="ident">replacement</span>[..<span class="ident">i</span>]);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="ident">i</span>..];
}
}
<span class="kw">if</span> <span class="ident">replacement</span>.<span class="ident">as_bytes</span>().<span class="ident">get</span>(<span class="number">1</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'$'</span>) {
<span class="ident">dst</span>.<span class="ident">push_str</span>(<span class="string">"$"</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="number">2</span>..];
<span class="kw">continue</span>;
}
<span class="macro">debug_assert!</span>(<span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">cap_ref</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">find_cap_ref</span>(<span class="ident">replacement</span>.<span class="ident">as_bytes</span>()) {
<span class="prelude-val">Some</span>(<span class="ident">cap_ref</span>) => <span class="ident">cap_ref</span>,
<span class="prelude-val">None</span> => {
<span class="ident">dst</span>.<span class="ident">push_str</span>(<span class="string">"$"</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="number">1</span>..];
<span class="kw">continue</span>;
}
};
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="ident">cap_ref</span>.<span class="ident">end</span>..];
<span class="kw">match</span> <span class="ident">cap_ref</span>.<span class="ident">cap</span> {
<span class="ident">Ref::Number</span>(<span class="ident">i</span>) => {
<span class="ident">dst</span>.<span class="ident">push_str</span>(<span class="ident">caps</span>.<span class="ident">get</span>(<span class="ident">i</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_str</span>()).<span class="ident">unwrap_or</span>(<span class="string">""</span>));
}
<span class="ident">Ref::Named</span>(<span class="ident">name</span>) => {
<span class="ident">dst</span>.<span class="ident">push_str</span>(
<span class="ident">caps</span>.<span class="ident">name</span>(<span class="ident">name</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_str</span>()).<span class="ident">unwrap_or</span>(<span class="string">""</span>),
);
}
}
}
<span class="ident">dst</span>.<span class="ident">push_str</span>(<span class="ident">replacement</span>);
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">expand_bytes</span>(
<span class="ident">caps</span>: <span class="kw-2">&</span><span class="ident">re_bytes::Captures</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>,
<span class="kw-2">mut</span> <span class="ident">replacement</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">dst</span>: <span class="kw-2">&mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
) {
<span class="kw">while</span> <span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>() {
<span class="kw">match</span> <span class="ident">find_byte</span>(<span class="string">b'$'</span>, <span class="ident">replacement</span>) {
<span class="prelude-val">None</span> => <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="ident">i</span>) => {
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="kw-2">&</span><span class="ident">replacement</span>[..<span class="ident">i</span>]);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="ident">i</span>..];
}
}
<span class="kw">if</span> <span class="ident">replacement</span>.<span class="ident">get</span>(<span class="number">1</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'$'</span>) {
<span class="ident">dst</span>.<span class="ident">push</span>(<span class="string">b'$'</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="number">2</span>..];
<span class="kw">continue</span>;
}
<span class="macro">debug_assert!</span>(<span class="op">!</span><span class="ident">replacement</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">cap_ref</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">find_cap_ref</span>(<span class="ident">replacement</span>) {
<span class="prelude-val">Some</span>(<span class="ident">cap_ref</span>) => <span class="ident">cap_ref</span>,
<span class="prelude-val">None</span> => {
<span class="ident">dst</span>.<span class="ident">push</span>(<span class="string">b'$'</span>);
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="number">1</span>..];
<span class="kw">continue</span>;
}
};
<span class="ident">replacement</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">replacement</span>[<span class="ident">cap_ref</span>.<span class="ident">end</span>..];
<span class="kw">match</span> <span class="ident">cap_ref</span>.<span class="ident">cap</span> {
<span class="ident">Ref::Number</span>(<span class="ident">i</span>) => {
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">caps</span>.<span class="ident">get</span>(<span class="ident">i</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_bytes</span>()).<span class="ident">unwrap_or</span>(<span class="string">b""</span>));
}
<span class="ident">Ref::Named</span>(<span class="ident">name</span>) => {
<span class="ident">dst</span>.<span class="ident">extend</span>(
<span class="ident">caps</span>.<span class="ident">name</span>(<span class="ident">name</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_bytes</span>()).<span class="ident">unwrap_or</span>(<span class="string">b""</span>),
);
}
}
}
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">replacement</span>);
}
<span class="doccomment">/// `CaptureRef` represents a reference to a capture group inside some text.</span>
<span class="doccomment">/// The reference is either a capture group name or a number.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is also tagged with the position in the text following the</span>
<span class="doccomment">/// capture reference.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">CaptureRef</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">cap</span>: <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
<span class="ident">end</span>: <span class="ident">usize</span>,
}
<span class="doccomment">/// A reference to a capture group in some text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// e.g., `$2`, `$foo`, `${foo}`.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">enum</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">Named</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>),
<span class="ident">Number</span>(<span class="ident">usize</span>),
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>) -> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">Ref::Named</span>(<span class="ident">x</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'static</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">x</span>: <span class="ident">usize</span>) -> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'static</span><span class="op">></span> {
<span class="ident">Ref::Number</span>(<span class="ident">x</span>)
}
}
<span class="doccomment">/// Parses a possible reference to a capture group name in the given text,</span>
<span class="doccomment">/// starting at the beginning of `replacement`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If no such valid reference could be found, None is returned.</span>
<span class="kw">fn</span> <span class="ident">find_cap_ref</span>(<span class="ident">replacement</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">CaptureRef</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">rep</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="ident">replacement</span>.<span class="ident">as_ref</span>();
<span class="kw">if</span> <span class="ident">rep</span>.<span class="ident">len</span>() <span class="op"><</span><span class="op">=</span> <span class="number">1</span> <span class="op">|</span><span class="op">|</span> <span class="ident">rep</span>[<span class="number">0</span>] <span class="op">!</span><span class="op">=</span> <span class="string">b'$'</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">rep</span>[<span class="ident">i</span>] <span class="op">==</span> <span class="string">b'{'</span> {
<span class="kw">return</span> <span class="ident">find_cap_ref_braced</span>(<span class="ident">rep</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cap_end</span> <span class="op">=</span> <span class="ident">i</span>;
<span class="kw">while</span> <span class="ident">rep</span>.<span class="ident">get</span>(<span class="ident">cap_end</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="ident">is_valid_cap_letter</span>) {
<span class="ident">cap_end</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="ident">cap_end</span> <span class="op">==</span> <span class="ident">i</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="comment">// We just verified that the range 0..cap_end is valid ASCII, so it must</span>
<span class="comment">// therefore be valid UTF-8. If we really cared, we could avoid this UTF-8</span>
<span class="comment">// check via an unchecked conversion or by parsing the number straight from</span>
<span class="comment">// &[u8].</span>
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span>
<span class="ident">str::from_utf8</span>(<span class="kw-2">&</span><span class="ident">rep</span>[<span class="ident">i</span>..<span class="ident">cap_end</span>]).<span class="ident">expect</span>(<span class="string">"valid UTF-8 capture name"</span>);
<span class="prelude-val">Some</span>(<span class="ident">CaptureRef</span> {
<span class="ident">cap</span>: <span class="kw">match</span> <span class="ident">cap</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>() {
<span class="prelude-val">Ok</span>(<span class="ident">i</span>) => <span class="ident">Ref::Number</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span>),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="ident">Ref::Named</span>(<span class="ident">cap</span>),
},
<span class="ident">end</span>: <span class="ident">cap_end</span>,
})
}
<span class="kw">fn</span> <span class="ident">find_cap_ref_braced</span>(<span class="ident">rep</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="kw-2">mut</span> <span class="ident">i</span>: <span class="ident">usize</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">CaptureRef</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span>;
<span class="kw">while</span> <span class="ident">rep</span>.<span class="ident">get</span>(<span class="ident">i</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">!</span><span class="op">=</span> <span class="string">b'}'</span>) {
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">rep</span>.<span class="ident">get</span>(<span class="ident">i</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="string">b'}'</span>) {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="comment">// When looking at braced names, we don't put any restrictions on the name,</span>
<span class="comment">// so it's possible it could be invalid UTF-8. But a capture group name</span>
<span class="comment">// can never be invalid UTF-8, so if we have invalid UTF-8, then we can</span>
<span class="comment">// safely return None.</span>
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">str::from_utf8</span>(<span class="kw-2">&</span><span class="ident">rep</span>[<span class="ident">start</span>..<span class="ident">i</span>]) {
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="kw">return</span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(<span class="ident">cap</span>) => <span class="ident">cap</span>,
};
<span class="prelude-val">Some</span>(<span class="ident">CaptureRef</span> {
<span class="ident">cap</span>: <span class="kw">match</span> <span class="ident">cap</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>() {
<span class="prelude-val">Ok</span>(<span class="ident">i</span>) => <span class="ident">Ref::Number</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span>),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="ident">Ref::Named</span>(<span class="ident">cap</span>),
},
<span class="ident">end</span>: <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>,
})
}
<span class="doccomment">/// Returns true if and only if the given byte is allowed in a capture name.</span>
<span class="kw">fn</span> <span class="ident">is_valid_cap_letter</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="ident">u8</span>) -> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">b</span> {
<span class="string">b'0'</span>..<span class="op">=</span><span class="string">b'9'</span> <span class="op">|</span> <span class="string">b'a'</span>..<span class="op">=</span><span class="string">b'z'</span> <span class="op">|</span> <span class="string">b'A'</span>..<span class="op">=</span><span class="string">b'Z'</span> <span class="op">|</span> <span class="string">b'_'</span> => <span class="bool-val">true</span>,
<span class="kw">_</span> => <span class="bool-val">false</span>,
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">find_cap_ref</span>, <span class="ident">CaptureRef</span>};
<span class="macro">macro_rules!</span> <span class="ident">find</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">text</span>:<span class="ident">expr</span>) => {
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">find_cap_ref</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">text</span>.<span class="ident">as_bytes</span>()));
}
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">text</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">capref</span>:<span class="ident">expr</span>) => {
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">capref</span>), <span class="ident">find_cap_ref</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">text</span>.<span class="ident">as_bytes</span>()));
}
};
}
<span class="macro">macro_rules!</span> <span class="ident">c</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name_or_number</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span>:<span class="ident">expr</span>) => {
<span class="ident">CaptureRef</span> { <span class="ident">cap</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name_or_number</span>.<span class="ident">into</span>(), <span class="ident">end</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span> }
};
}
<span class="macro">find!</span>(<span class="ident">find_cap_ref1</span>, <span class="string">"$foo"</span>, <span class="macro">c!</span>(<span class="string">"foo"</span>, <span class="number">4</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref2</span>, <span class="string">"${foo}"</span>, <span class="macro">c!</span>(<span class="string">"foo"</span>, <span class="number">6</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref3</span>, <span class="string">"$0"</span>, <span class="macro">c!</span>(<span class="number">0</span>, <span class="number">2</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref4</span>, <span class="string">"$5"</span>, <span class="macro">c!</span>(<span class="number">5</span>, <span class="number">2</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref5</span>, <span class="string">"$10"</span>, <span class="macro">c!</span>(<span class="number">10</span>, <span class="number">3</span>));
<span class="comment">// See https://github.com/rust-lang/regex/pull/585</span>
<span class="comment">// for more on characters following numbers</span>
<span class="macro">find!</span>(<span class="ident">find_cap_ref6</span>, <span class="string">"$42a"</span>, <span class="macro">c!</span>(<span class="string">"42a"</span>, <span class="number">4</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref7</span>, <span class="string">"${42}a"</span>, <span class="macro">c!</span>(<span class="number">42</span>, <span class="number">5</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref8</span>, <span class="string">"${42"</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref9</span>, <span class="string">"${42 "</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref10</span>, <span class="string">" $0 "</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref11</span>, <span class="string">"$"</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref12</span>, <span class="string">" "</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref13</span>, <span class="string">""</span>);
<span class="macro">find!</span>(<span class="ident">find_cap_ref14</span>, <span class="string">"$1-$2"</span>, <span class="macro">c!</span>(<span class="number">1</span>, <span class="number">2</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref15</span>, <span class="string">"$1_$2"</span>, <span class="macro">c!</span>(<span class="string">"1_"</span>, <span class="number">3</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref16</span>, <span class="string">"$x-$y"</span>, <span class="macro">c!</span>(<span class="string">"x"</span>, <span class="number">2</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref17</span>, <span class="string">"$x_$y"</span>, <span class="macro">c!</span>(<span class="string">"x_"</span>, <span class="number">3</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref18</span>, <span class="string">"${#}"</span>, <span class="macro">c!</span>(<span class="string">"#"</span>, <span class="number">4</span>));
<span class="macro">find!</span>(<span class="ident">find_cap_ref19</span>, <span class="string">"${Z[}"</span>, <span class="macro">c!</span>(<span class="string">"Z["</span>, <span class="number">5</span>));
}
</code></pre></div>
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