duannuochi3549 2016-09-28 08:03
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正则表达式仅在{display:none}之前提取CSS类名

I can't find a correct regular expression to extract classes names. It is my code:

preg_match_all('@\.(.*!\.){display:none}@', '.UlEa{display:none}.RNLW{display:inline}.jc0k{display:none}.Lyhf{display:inline}', $matches);

The $matches is empty. How should look correct regular expression?

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  • douhuan1905 2016-09-28 08:12
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    Note that your regex matches a literal ., then captures a sequence of any 0+ chars other than linebreak symbols as many as possible up to the last !. sequence and then matches {display:none}. Since your text does not contain ! nor the next . you have no match.

    One way to get your matches is to use \w+ (=one or more word characters, those in the [a-zA-Z0-9_] set) pattern inside Group 1:

    \.(\w+){display:none}
    

    See the regex demo

    PHP demo:

    preg_match_all('@\.(\w+){display:none}@', '.UlEa{display:none}.RNLW{display:inline}.jc0k{display:none}.Lyhf{display:inline}', $matches);
    print_r($matches[1]); // => Array ( [0] => UlEa [1] => jc0k  )
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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