My obfuscation script can do the dirty work for ya...
http://sandgnat.com/cmos/ .
Click the link to the live rule generator and try:
BODY /\bsex\b/
Make sure to check "match obfu only". (the trick is the negative look-ahead)

HTH,
Chris

P.S. lotsa Chris's around here,eh?

Theo Van Dinter said:
> On Tue, Nov 04, 2003 at 05:34:53PM -0800, Christopher Eykamp wrote:
>> How can I match the following: "s\.ex" and "se\.x" and "s\.e\.x" but not
>> "sex" without including all the possible permutations?  Is there an
>> elegant
>> solution?
>
> Well, I have two thoughts on this.
>
> 1) you're trying to do something programatic (permutation), which regexp
>    doesn't really do.  I can't think of a "neat" way to do it.
> 2) the easiest route would be to use | and do the permutations.
>
> /s(?:e\.|\.e\.?)x/
>
> Unless it's a really slow or complicated regexp, I try not to spend more
> time on it than necessary.
>
> --
> Randomly Generated Tagline:
> "Kids... Can't live with 'em, can't shoot 'em."      - From Grumpy Old Men
>



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