Regular Expressions 101

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/
(?<=[\w ]\()([^;\n]|".*?")*(?=\))
/
gmx
Positive Lookbehind
(?<=[\w ]\()
Assert that the Regex below matches
Match a single character present in the list below
[\w ]
\w matches any word character (equal to [a-zA-Z0-9_])
matches the character literally (case sensitive)
\( matches the character ( literally (case sensitive)
1st Capturing Group
([^;\n]|".*?")*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
1st Alternative
[^;\n]
Match a single character not present in the list below
[^;\n]
; matches the character ; literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
2nd Alternative
".*?"
" matches the character " literally (case sensitive)
.*?
matches any character (except for line terminators)
*? Quantifier — Matches between zero and unlimited times, as few times as possible, expanding as needed (lazy)
" matches the character " literally (case sensitive)
Positive Lookahead
(?=\))
Assert that the Regex below matches
\) matches the character ) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
x modifier: extended. Spaces and text after a # in the pattern are ignored
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmx

Test String