php正则表达式替换图像标签

Question

我需要用微笑替换图像标签{smile:smilename}

   <?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 );
    ?>

我明白了:

<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}>

但是我需要

• {smile:smile3}

Answer 1

你<和>被视为分隔符,而不是表达的一部分.使用:

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

请参阅php.net regexp delimiters文档(第三个代码示例和顶级用户注释)

Answer 2

您需要在模式中使用分隔符并在内部转义此字符.

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

要么

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