我需要将图片标签替换为微笑以{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}
您的<和>被视为分隔符，而不是表达式的一部分。用途：
$pattern = '#<img src="/img/smile/(.*?).gif">#';
请参阅php.net regexp分隔符文档（第三个代码示例和顶部用户注释）
您需要在模式中使用分隔字符，并在其中转义此字符。
$pattern = '/<img src="'/img'/smile'/(.*?).gif">/';
或
$pattern = '@<img src="/img/smile/(.*?).gif">@';