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162 lines
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HTML
162 lines
7.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>转义正则表达式字符</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.preg-quote" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">preg_quote</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">preg_quote</span> — <span class="dc-title">转义正则表达式字符</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.preg-quote-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>preg_quote</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$delimiter</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>preg_quote()</strong></span>需要参数 <code class="parameter">str</code> 并向其中
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每个正则表达式语法中的字符前增加一个反斜线。 这通常用于你有一些运行时字符串
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需要作为正则表达式进行匹配的时候。
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</p>
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<p class="para">
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正则表达式特殊字符有：
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<em>. \ + * ? [ ^ ] $ ( ) { } = ! < > | : -</em>
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</p>
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<p class="para">
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注意 <em>/</em> 不是正则表达式特殊字符。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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注意：<span class="function"><strong>preg_quote()</strong></span> 的应用场景不是用于 <span class="function"><a href="preg_replace.html" class="function">preg_replace()</a></span> 的 $replacement 字符串参数。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.preg-quote-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">str</code></dt>
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<dd>
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<p class="para">
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输入字符串
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</p>
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</dd>
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<dt>
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<code class="parameter">delimiter</code></dt>
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<dd>
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<p class="para">
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如果指定了可选参数 <code class="parameter">delimiter</code>，它也会被转义。这通常用于
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转义PCRE函数使用的分隔符。 <em>/</em> 是最常见的分隔符。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.preg-quote-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回转义后的字符串。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.preg-quote-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.0</td>
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<td>
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字符 <em>-</em> 被增加为需要转义的。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.preg-quote-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-5866">
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<p><strong>Example #1 <span class="function"><strong>preg_quote()</strong></span>示例</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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">// 返回 \$40 for a g3\/400<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-5867">
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<p><strong>Example #2 将文本中的单词替换为斜体</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">//在这个例子中，preg_quote($word) 用于保持星号原文涵义，使其不使用正则表达式中的特殊语义。<br /><br /></span><span style="color: #0000BB">$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">$word</span><span style="color: #007700">, </span><span style="color: #DD0000">'/'</span><span style="color: #007700">) . </span><span style="color: #DD0000">"/"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"<i>" </span><span style="color: #007700">. </span><span style="color: #0000BB">$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>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.preg-quote-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数可安全用于二进制对象。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.preg-quote-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><a href="pcre.pattern.html" class="link">PCRE 模式</a></li>
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<li class="member"><span class="function"><a href="escapeshellcmd.html" class="function" rel="rdfs-seeAlso">escapeshellcmd()</a> - shell 元字符转义</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |