Re: How do I match a expression start with $a and not contain $b after $a

It's easier to split up the task and use two regexes: /$a/ && !/$a.*?$b/s; If you still very much want to have it in one regex you can use /^(?>.*?$a)(?!.*?$b)/s; but that not compatible with perl 5.004 or earlier. (You can rewrite it to be compatible with perl 5.004, but I'll leave that as an exercise for you. Hint: look in the perlre manpage.)

-Anomo

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Re: Re: How do I match a expression start with $a and not contain $b after $a by Anonymous Monk on Jan 29, 2002 at 06:33 UTC
I just noticed that it's not totally clear whether 'xfoobar' should match or not with $a = 'foo' and $b = 'bar'. -Anomo	[reply]