Regex nested parentheses

by

You can use this:

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

With your example you obtain:

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

Explanation:

(?>\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)

You can try it with this code:

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);
}

More Related Contents:

  1. Find and extract a number from a string
  2. How do I replace the *first instance* of a string in .NET?
  3. Remove text in-between delimiters in a string (using a regex?)
  4. Need to perform Wildcard (*,?, etc) search on a string using Regex
  5. How do I match an entire string with a regex?
  6. How to convert UTF-8 byte[] to string
  7. How can I String.Format a TimeSpan object with a custom format in .NET?
  8. How do I replace multiple spaces with a single space in C#?
  9. Way to have String.Replace only hit “whole words”
  10. String Concatenation using ‘+’ operator
  11. How to parse a string into a nullable int
  12. What’s the difference between “groups” and “captures” in .NET regular expressions?
  13. String interning in .Net Framework – What are the benefits and when to use interning
  14. Compare String and Object in C#
  15. Using WebClient in C# is there a way to get the URL of a site after being redirected?
  16. Split String into smaller Strings by length variable
  17. Removing hidden characters from within strings
  18. Compare string similarity
  19. Regex : how to get words from a string (C#)
  20. Find substring in a list of strings
  21. Convert string to hex-string in C#
  22. What method in the String class returns only the first N characters?
  23. split a string on newlines in .NET
  24. Ignoring white space for a Regex match
  25. Validating file types by regular expression
  26. string.Empty vs null.Which one do you use?
  27. How to make a regex match case insensitive?
  28. Get values between curly braces c#
  29. Does any one know of a faster method to do String.Split()?
  30. regex to split line (csv file)

Leave a Comment