.net - 正则表达式跟踪 `)`

Question

这个问题在这里已经有了答案:





Using RegEx to balance match parenthesis

(4 个回答)



Matching Nested Structures With Regular Expressions in Python

(6 个回答)


7年前关闭。




假设我的输入是 fn(a(b,c),d) fn(a,d) fn(a(b),d)我想要 a(b,c),d我将如何编写一个模式来获取 () 中的所有内容？第二个 fn() 很容易，第一个和第三个我不知道如何匹配

Answer 1

您需要 balancing group definitions为了这:

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;