php regex替换图像标记

Question

我需要将图片标签替换为{微笑:微笑}

   <?php
    $pattern = '<img src="/img/smile/(.*?).gif">';
    $replacement = '{smile:$1}';
    $subject = '<div contenteditable="true" id="message_text">text<img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"><img src="/img/smile/smile3.gif"></div>';
    echo preg_replace($pattern, $replacement, $subject, -1 );
    ?>

我得到：

<div contenteditable="true" id="message_text">text<{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}><{smile:smile3}></div> 

• <{smile:smile3}>

但我需要

• {smile:smile3}

Answer 1

您的<和>被视为分隔符，而不是表达式的一部分。使用：

$pattern = '#<img src="/img/smile/(.*?).gif">#';

参见php.net regexp分隔符文档 (第三个代码示例和顶部用户注释)

Answer 2

您需要在模式中使用分隔字符，并在内部转义此字符。

$pattern = '/<img src="\/img\/smile\/(.*?).gif">/';

或

$pattern = '@<img src="/img/smile/(.*?).gif">@';