Re^2: Blacklisting with a Regular Expression

/^(?!.*(?:evil|bad|wrong))/
[download]

Bingo. This is the correct solution.

I tried this one a little earlier (knowing why it wasn't working):

/^.*(?!evil|bad|wrong)/
[download]

...but it never occurred to me to put the .* INSIDE the negative lookahead.

<slaps forehead/>

Thanks to the rest of you for helping, but most of you actually reversed the problem. The regex needed to return a match from the clean string, not from the string containing the blacklisted tokens.

Thanks!!

--Benji

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Re^3: Blacklisting with a Regular Expression by hv (Prior) on Aug 19, 2005 at 01:29 UTC
Just for the sake of completeness, here's an alternative: `/^(?:(?!evil\|bad\|wrong).)*\z/` [download] Eimi's solution is much faster for the problem as given, but this approach gives more control - if your problem becomes any more complex in the future it's a useful trick to have available. Hugo	[reply] [d/l]