Regular Expressions 101

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/
\((?<arguments>(([^\(\)']*)|(\([^\(\)']*\))|'(.*?)')*)\)
/
g
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Named Capture Group arguments
(?<arguments>(([^\(\)']*)|(\([^\(\)']*\))|'(.*?)')*)
2nd Capturing Group
(([^\(\)']*)|(\([^\(\)']*\))|'(.*?)')*
* matches the previous token 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
([^\(\)']*)
3rd Capturing Group
([^\(\)']*)
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)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
2nd Alternative
(\([^\(\)']*\))
4th Capturing Group
(\([^\(\)']*\))
\( 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)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
3rd Alternative
'(.*?)'
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
5th Capturing Group
(.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
' matches the character ' with index 3910 (2716 or 478) 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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression