Splitting string on dots but not on dots within round brackets-CodePudding

I would like to achieve the above but didn't manage it.

I already tried the regex "\.(?![^(]*\))" but it does not work so far.

I want to split the string "replace(<<accountname>>.right(4), Saturn).invert()" like this:

replace(<<accountname>>.right(4), Saturn)
invert()

CodePudding user response：

You can use a matching approach, i.e. match any one or more occurrences of a string between balanced parentheses or any char other than a .:

var output = Regex.Matches(text, @"(?:\((?>[^()] |(?<o>)\(|(?<-o>)\))*\)|[^.]) ")
    .Cast<Match>()
    .Select(x => x.Value)
    .ToList();

See the .NET regex demo. Details:

(?: - start of a "container" non-capturing group:
- \( - a ( char
- (?>[^()] |(?<o>)\(|(?<-o>)\))* - zero or more occurrences (backtracking into the pattern is disabled since the (?>...) is an atomic group, this way the pattern is efficient) of
  - [^()] | - one or more chars other than a ( and ), or
  - (?<o>)\(| - a ( char, and a value is pushed on to Group "o" capture stack, or
  - (?<-o>)\) - a ) char, and a value is popped off the Group "o" capture stack
- \) - a ) char
| - or
- [^.] - any char other than a . char
) - end of the group, repeat one or more times.

CodePudding user response：

It's a little difficult to really test this without some examples, but does this do what you want?

(?<!\()\.(?!\))

Explanation: It uses a negative lookbehind to ensure the character before the dot is not an opening parenthesis and a negative lookahead to ensure the character after it is not a closing parenthesis.