Regular Expressions 101

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/
;(?!.*\)|\()
/
g
; matches the character ; with index 5910 (3B16 or 738) literally (case sensitive)
Negative Lookahead
(?!.*\)|\()
Assert that the Regex below does not match
1st Alternative
.*\)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
2nd Alternative
\(
\( matches the character ( with index 4010 (2816 or 508) 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