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 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 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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String

Code Generator

Generated Code

Loading code sample...
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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html