BTW: If you like  (?!) and have access to Perl version 5.10+, check out Special Backtracking Control Verbs in perlre.  (?!) actually compiles to  (*FAIL) now (I think — or maybe it's the other way around).

In reply to Re: regex backtracking question by AnomalousMonk
in thread regex backtracking question by aeqr

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