Need regexp tip

[NFN Smith <wo...@sacbeemail.com>]

I'm working on a series of rules to find obfuscated words in subject 
lines that have been misspelled by adding an extra character (often a 
repeated letter) to a word.  For certain words, it seems to be 
appropriate to assume that if they're misspelled in that way, it's 
deliberate.

I've got the syntax for a regular expression mostly working (including 
words with trailing punctuation), but I don't have it identifying words 
where the last letter is doubled.  Thus if I have a regexp that looks like:

  /\b(?!badword)(?:b.?a.?d.?w.?o.?r.?d.?)(\b|\!|\.|\,|\;|\:|\?)/i

I'm getting hits on things like 'baddword' and 'badwoord', and even 
'badworrd!', but I'm not getting a hit on 'badwordd'

I've tried a number of variants, but still am not quite getting it. 
What am I missing?

Smith

Re: Need regexp tip

["John D. Hardin" <jh...@impsec.org>]

On Tue, 5 Dec 2006, NFN Smith wrote:

> I'm working on a series of rules to find obfuscated words 
> 
>   /\b(?!badword)(?:b.?a.?d.?w.?o.?r.?d.?)(\b|\!|\.|\,|\;|\:|\?)/i

I have a tool that does this (for double letters as well as other
obfuscations) automatically.

http://www.impsec.org/~jhardin/antispam/

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