c# - 正则表达式嵌套括号

Question

我有以下字符串:

a,b,c,d.e(f,g,h,i(j,k)),l,m,n

知道的人会告诉我如何构建一个只返回“第一级”括号的正则表达式，如下所示:

[0] = a,b,c,
[1] = d.e(f,g,h,i.j(k,l))
[2] = m,n

目标是将具有相同索引的部分保留在嵌套的括号中以操纵 future 。

谢谢。

编辑

正在尝试改进示例...

假设我有这个字符串

username,TB_PEOPLE.fields(FirstName,LastName,TB_PHONE.fields(num_phone1, num_phone2)),password

我的目标是将字符串转换为动态查询。那么不以“TB_”开头的字段我知道它们是主表的字段，否则我知道括号内的informandos字段与另一个表相关。但是我很难检索“第一级”所有字段，因为我可以将它们与相关表分开，我可以递归地恢复剩余字段。

最后，会是这样的:

[0] = username,password
[1] = TB_PEOPLE.fields(FirstName,LastName,TB_PHONE.fields(num_phone1, num_phone2))

抱歉，我希望我解释得更好一些。

Answer 1

你可以使用这个:

(?>\w+\.)?\w+\((?>\((?<DEPTH>)|\)(?<-DEPTH>)|[^()]+)*\)(?(DEPTH)(?!))|\w+

通过您的示例，您获得:

0 => username
1 => TB_PEOPLE.fields(FirstName,LastName,TB_PHONE.fields(num_phone1, num_phone2))
2 => password

解释:

(?>\w+\.)? \w+ \(    # the opening parenthesis (with the function name)
(?>                  # open an atomic group
    \(  (?<DEPTH>)   # when an opening parenthesis is encountered,
                     #  then increment the stack named DEPTH
  |                  # OR
    \) (?<-DEPTH>)   # when a closing parenthesis is encountered,
                     #  then decrement the stack named DEPTH
  |                  # OR
    [^()]+           # content that is not parenthesis
)*                   # close the atomic group, repeat zero or more times
\)                   # the closing parenthesis
(?(DEPTH)(?!))       # conditional: if the stack named DEPTH is not empty
                     #  then fail (ie: parenthesis are not balanced)

你可以用这段代码试试:

string input = "username,TB_PEOPLE.fields(FirstName,LastName,TB_PHONE.fields(num_phone1, num_phone2)),password";
string pattern = @"(?>\w+\.)?\w+\((?>\((?<DEPTH>)|\)(?<-DEPTH>)|[^()]+)*\)(?(DEPTH)(?!))|\w+";
MatchCollection matches = Regex.Matches(input, pattern);
foreach (Match match in matches)
{
    Console.WriteLine(match.Groups[0].Value);
}