写了一个正则,在 Atom 里面显示是可以匹配的,但是在 Pycharm 里面运行就不对了 - V2EX
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fee

写了一个正则,在 Atom 里面显示是可以匹配的,但是在 Pycharm 里面运行就不对了

  •  
  •   fee Aug 20, 2018 3509 views
    This topic created in 2841 days ago, the information mentioned may be changed or developed.
    我写的正则是: https://.+?(jpg|gif)
    然后要匹配的地址是一串如: https:///i.imgur.com/TA3T3gU.gifhttps://i.redd.it/msevs1zayzg11.jpghttps://i.redd.it/msevs1zayzg11.jpg 。。。
    在 Atom 里面试验的时候是可以匹配的。但是 pycharm 里面运行错误,我把匹配的结果打印出来显示是:['gif', 'jpg', 'jpg', 'jpg', 'jpg', 'gif', 'jpg', 'jpg'...]
    也就是只匹配了(jpg|gif)
    是什么情况,大家能指点下么?
    11 replies    2018-08-20 14:47:04 +08:00
    Xiaobaixiao
        1
    Xiaobaixiao  
       Aug 20, 2018   1
    我猜你用的是 re.findall()
    fee
        2
    fee  
    OP
       Aug 20, 2018
    @Xiaobaixiao 是的。。
    wizardoz
        3
    wizardoz  
       Aug 20, 2018   1
    ( https://.+?(?:jpg|gif))
    这样行不?
    whusnoopy
        4
    whusnoopy  
       Aug 20, 2018   2
    因为 Python 需要用圆括号括起来你要匹配的部分,参考下面

    ```python
    >>> re.findall(r'( https://.+?(jpg|gif))', 'https:///i.imgur.com/TA3T3gU.gifhttps://i.redd.it/msevs1zayzg11.jpghttps://i.redd.it/msevs1zayzg11.jpg')
    [('https:///i.imgur.com/TA3T3gU.gif', 'gif'), ('https://i.redd.it/msevs1zayzg11.jpg', 'jpg'), ('https://i.redd.it/msevs1zayzg11.jpg', 'jpg')]
    ```
    JHerschel
        5
    JHerschel  
       Aug 20, 2018   2
    chroming
        6
    chroming  
       Aug 20, 2018 via Android
    ()是正则分组
    ooleslie
        7
    ooleslie  
       Aug 20, 2018
    @whusnoopy 为啥匹配出来的结果会多 gif 和 jpg 的结果,是因为 findall 的正则有内外两个括号么?
    dartabe
        8
    dartabe  
       Aug 20, 2018
    我最近也在学这个 感觉 findall 各种坑 finditer 就是好好的
    whusnoopy
        9
    whusnoopy  
       Aug 20, 2018   1
    @ooleslie 是的,Python 里的括号是分组,这里有内外两个括号就是匹配出这两个组
    ooleslie
        10
    ooleslie  
       Aug 20, 2018
    @dartabe 我是跟着韦炜那本书学的,讲得太粗糙了
    dartabe
        11
    dartabe  
       Aug 20, 2018
    @ooleslie 前面那个答案比较好 如果用 findall 的话 就用(?: jpg|gif)
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