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77 lines
5.5 KiB
HTML
77 lines
5.5 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>正则表达式匹配</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.ereg" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ereg</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">ereg</span> — <span class="dc-title">正则表达式匹配</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.ereg-unknown-unknown-seealsq">
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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>ereg</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$pattern</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$regs</code></span>
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] ) : <span class="type">int</span></div>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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使用 Perl 兼容正则表达式语法的 <span class="function"><a href="preg_match.html" class="function">preg_match()</a></span>
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函数通常是比 <span class="function"><strong>ereg()</strong></span> 更快的替代方案。
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</p>
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</p></blockquote>
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<p class="simpara">
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以区分大小写的方式在 <code class="parameter">string</code>
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中寻找与给定的正则表达式 <code class="parameter">pattern</code> 所匹配的子串。
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</p>
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<p class="simpara">
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如果找到与 <code class="parameter">pattern</code>
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中圆括号内的子模式相匹配的子串并且函数调用给出了第三个参数
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<code class="parameter">regs</code>，则匹配项将被存入
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<code class="parameter">regs</code> 数组中。$regs[1]
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包含第一个左圆括号开始的子串，$regs[2]
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包含第二个子串，以此类推。$regs[0] 包含整个匹配的字符串。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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直到 PHP 4.1.0 为止，<var class="varname"><var class="varname">$regs</var></var>
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将被填充为正好十个单元，即使实际匹配的子串少于十个。这并不影响
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<span class="function"><strong>ereg()</strong></span> 匹配更多子串的能力。如果没有找到匹配，则
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<em>$regs</em> 不会被 <span class="function"><strong>ereg()</strong></span> 更改。
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</span>
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</p></blockquote>
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<p class="simpara">
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如果在 <code class="parameter">string</code>
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中找到 <code class="parameter">pattern</code> 模式的匹配则返回
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所匹配字符串的长度，如果没有找到匹配或出错则返回 <strong><code>FALSE</code></strong>。如果没有传递入可选参数
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<code class="parameter">regs</code> 或者所匹配的字符串长度为 0，则本函数返回 1。
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</p>
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<p class="para">
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以下代码片断接受 ISO 格式的日期（YYYY-MM-DD）然后以
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DD.MM.YYYY 格式显示：
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</p>
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<p class="para">
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<div class="example" id="example-5884">
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<p><strong>Example #1 <span class="function"><strong>ereg()</strong></span> 例子</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: #007700">if (</span><span style="color: #0000BB">ereg </span><span style="color: #007700">(</span><span style="color: #DD0000">"([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})"</span><span style="color: #007700">, </span><span style="color: #0000BB">$date</span><span style="color: #007700">, </span><span style="color: #0000BB">$regs</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$regs</span><span style="color: #007700">[</span><span style="color: #0000BB">3</span><span style="color: #007700">]</span><span style="color: #DD0000">.</span><span style="color: #0000BB">$regs</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]</span><span style="color: #DD0000">.</span><span style="color: #0000BB">$regs</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"Invalid date format: </span><span style="color: #0000BB">$date</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br />}<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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参见 <span class="function"><a href="eregi.html" class="function">eregi()</a></span>，<span class="function"><a href="ereg_replace.html" class="function">ereg_replace()</a></span>，<span class="function"><a href="eregi_replace.html" class="function">eregi_replace()</a></span>，<span class="function"><a href="preg_match.html" class="function">preg_match()</a></span>，<span class="function"><a href="strpos.html" class="function">strpos()</a></span>
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和 <span class="function"><a href="strstr.html" class="function">strstr()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |