.net – 正则表达式跟踪`)`[复制]

发布时间：2020-12-14 06:01:06 所属栏目：百科来源：网络整理

导读：参见英文答案 Using RegEx to balance match parenthesis????????????????????????????????????4个 ???????????? Matching Nested Structures With Regular Expressions in Python????????????????????????????????????6个让我说我的输入是fn(a(b,c),d)fn(a

参见英文答案 > Using RegEx to balance match parenthesis????????????????????????????????????4个
>???????????? Matching Nested Structures With Regular Expressions in Python????????????????????????????????????6个
让我说我的输入是fn(a(b,c),d)fn(a,d)fn(a(b),d)我想要一个(b,d我怎么写一个模式来得到()里面的一切？第二个fn()很容易第一个和第三个我不知道如何匹配

解决方法

你需要 balancing group definitions：

result = Regex.Match(subject,@"(?<=()              # Make sure there's a ( before the start of the match
        (?>                # now match...
           [^()]+          # any characters except parens
        |                  # or
           (  (?<DEPTH>)  # a (,increasing the depth counter
        |                  # or
           )  (?<-DEPTH>) # a ),decreasing the depth counter
        )*                 # any number of times
        (?(DEPTH)(?!))     # until the depth counter is zero again
      (?=))               # Make sure there's a ) after the end of the match",RegexOptions.IgnorePatternWhitespace).Value;

（编辑：李大同）

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