Regex to match only comma's but not inside multiple parentheses

Question

Okay, i have this case where comma are inside parenthesis, I want to match the commas that are only outside the parenthesis.

Input : color-stop(50%,rgb(0,0,0         


        

Answer 1

Here is the regex which works perfectly for your input.

,(?![^()]*(?:\([^()]*\))?\))

DEMO

Explanation:

,                        ','
(?!                      look ahead to see if there is not:
  [^()]*                   any character except: '(', ')' (0 or
                           more times)
  (?:                      group, but do not capture (optional):
    \(                       '('
    [^()]*                   any character except: '(', ')' (0 or
                             more times)
    \)                       ')'
  )?                       end of grouping, ? after the non-capturing group makes the
                           whole non-capturing group as optional.
  \)                       ')'
)                        end of look-ahead