2019-07-06 14:50
采纳率: 100%
浏览 117


I try to match all images that contain a specific class by using the preg_match_all function.

This is my old code that match the all images in the content:

preg_match_all( '/<img[\s
]+.*?>/is', $content, $matches );

And this is the code that I try to made to match the images that only have a specific class but I failed:

preg_match_all( "/(<img((?!(.*?)class=['\"](.*?)comment-media(.*?)['\"](.*?)).)*>)+/is", $content, $matches );

The class that I need to search for it is: comment-media

图片转代码服务由CSDN问答提供 功能建议

我尝试使用 preg_match_all 函数匹配包含特定类的所有图像。


  preg_match_all('/&lt; img [\ s \  r 
] +。*?&gt; /是',$ content,$ matches); 

这是我尝试匹配的代码 只有特定类但我失败的图像:

  preg_match_all(“/(&lt; img((?!(。*?)class = ['\”]  (。*?)comment-media(。*?)['\“](。*?))。)*&gt;)+ /是”,$ content,$ matches); 

我需要搜索的类是: comment-media

  • 写回答
  • 好问题 提建议
  • 关注问题
  • 收藏
  • 邀请回答

1条回答 默认 最新

  • dongxin8392 2019-07-06 15:58

    Your regex matches every img tag that has not the comment-media class. Regex101 lists this part as being "Negative Lookahead":


    You'll need to remove that negative lookahead.

    The resulting regex expression will be:


    See it in action here:

    What is a negative lookahead?

    A negative lookahead is used to match something not followed by something else. It always starts with (?!. For example, to match a string foo not followed by bar, one would use:


    To match foobar not followed by digits, one would use:

    # Notice the parenthesis around the part of the negative lookahead. You'll need these to use lookaheads with regex expressions.

    Note that the lookahead is not part of a capturing group.

    More details are available here.

    解决 无用
    打赏 举报

相关推荐 更多相似问题