/^(?!.*(?: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

In reply to Re^2: Blacklisting with a Regular Expression by BenjiSmith
in thread Blacklisting with a Regular Expression by BenjiSmith

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