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php 怎么用正则表达式替换内容

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Release： 2016-06-06 20:26:01
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你好世界 <img title="你好世界" alt="你好世界">
这段文字，怎么通过php的正则表达式函数 替换成
你好世界<img title="你好世界" alt="你好世界">
要求就是关键词在标签属性内的不加a标签。在标签以外的都加上。

回复内容：

你好世界 <img title="你好世界" alt="你好世界">
这段文字，怎么通过php的正则表达式函数 替换成
你好世界<img title="你好世界" alt="你好世界">
要求就是关键词在标签属性内的不加a标签。在标签以外的都加上。

<code>$subject = '<img title="你好世界" alt="你好世界">你好世界<img title="你好世界" alt="你好世界">';
$pattern = "/(好世)(?![^\'\">$1", $subject );
echo $result; </code>
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