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php正则匹配问题，怎么不出来结果
- WBOYOriginal
- 2016-06-02 11:32:03998browse
正则匹配php
<code> $contents='<td width="20%" align="center">'; preg_match_all('/</td>
<td width="20%" print_r>
<p>如上写法匹配结果为空。请问有什么题？</p>
<pre class="brush:php;toolbar:false"><code> $contents='<td width="20%" align="center">'; preg_match_all('/width="20%"/', $contents, $result); print_r($result); <p>这中方法可以出来结果，请问是怎么会回事？</p> </td></code>
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