Regular Expressions 101

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/
\((?:[^)(]+|\((?:[^)(]+|\([^)(]*\))*\))*\)
/
g
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Non-capturing group
(?:[^)(]+|\((?:[^)(]+|\([^)(]*\))*\))*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^)(]+
Match a single character not present in the list below
[^)(]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
)(
matches a single character in the list )( (case sensitive)
2nd Alternative
\((?:[^)(]+|\([^)(]*\))*\)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Non-capturing group
(?:[^)(]+|\([^)(]*\))*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^)(]+
Match a single character not present in the list below
[^)(]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
)(
matches a single character in the list )( (case sensitive)
2nd Alternative
\([^)(]*\)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Match a single character not present in the list below
[^)(]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
)(
matches a single character in the list )( (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
g

Test String