/(?:$RegexGoesHere(?!)|(?=))/

Ok, right. The previous construction was incorrect. I think using the experimental conditional test would work here since now the (?!) does not connect via backtracking to the (?=).

/(?((?:$RegexGoesHere))(?!)|(?=))/

In reply to Re: negative regex without !~ by diotalevi
in thread negative regex without !~ by mbr

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