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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Quote regular expression characters</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.preg-match.html">preg_match</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-replace-callback.html">preg_replace_callback</a></div> <div class="up"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.preg-quote" class="refentry"> <div class="refnamediv"> <h1 class="refname">preg_quote</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">preg_quote</span> — <span class="dc-title">Quote regular expression characters</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>preg_quote</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$delimiter</tt></span> ] )</div> <p class="para rdfs-comment"> <b>preg_quote()</b> takes <i><tt class="parameter">str</tt></i> and puts a backslash in front of every character that is part of the regular expression syntax. This is useful if you have a run-time string that you need to match in some text and the string may contain special regex characters. </p> <p class="para"> The special regular expression characters are: <i>. \ + * ? [ ^ ] $ ( ) { } = ! < > | :</i> </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">str</tt></i></span> <dd> <p class="para"> The input string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">delimiter</tt></i></span> <dd> <p class="para"> If the optional <i><tt class="parameter">delimiter</tt></i> is specified, it will also be escaped. This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the quoted string. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>preg_quote()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$keywords </span><span style="color: #007700">= </span><span style="color: #DD0000">'$40 for a g3/400'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$keywords </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_quote</span><span style="color: #007700">(</span><span style="color: #0000BB">$keywords</span><span style="color: #007700">, </span><span style="color: #DD0000">'/'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$keywords</span><span style="color: #007700">; </span><span style="color: #FF8000">// returns \$40 for a g3\/400<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 Italicizing a word within some text</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// In this example, preg_quote($word) is used to keep the<br />// asterisks from having special meaning to the regular<br />// expression.<br /><br /></span><span style="color: #0000BB">$textbody </span><span style="color: #007700">= </span><span style="color: #DD0000">"This book is *very* difficult to find."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$word </span><span style="color: #007700">= </span><span style="color: #DD0000">"*very*"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$textbody </span><span style="color: #007700">= </span><span style="color: #0000BB">preg_replace </span><span style="color: #007700">(</span><span style="color: #DD0000">"/" </span><span style="color: #007700">. </span><span style="color: #0000BB">preg_quote</span><span style="color: #007700">(</span><span style="color: #0000BB">$word</span><span style="color: #007700">) . </span><span style="color: #DD0000">"/"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"<i>" </span><span style="color: #007700">. </span><span style="color: #0000BB">$word </span><span style="color: #007700">. </span><span style="color: #DD0000">"</i>"</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">$textbody</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function isbinary-safe.</span></p></blockquote> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.preg-match.html">preg_match</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.preg-replace-callback.html">preg_replace_callback</a></div> <div class="up"><a href="ref.pcre.html">PCRE Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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