Wow, tough crowd for a Friday afternoon. From http://www.computerhope.com/jargon/c/clbuttic.htm:

More commonly known as the Scunthorpe problem, clbuttic is an issue that occurs with filters such as spam filters that mistakenly blocks or denies something that is valid. The Scunthorpe problem derives from the swearword filter AOL was using in 1996 that blocked valid users who were living in this town from creating accounts from the obscene keyword found within this towns name.

There's even a Wikipedia article.

Telegraph article: http://www.telegraph.co.uk/news/newstopics/howaboutthat/2667634/The-Clbuttic-Mistake-When-obscenity-filters-go-wrong.html

Blog with more references that also mentions \b: http://blog.codinghorror.com/obscenity-filters-bad-idea-or-incredibly-intercoursing-bad-idea/

In reply to Re^3: [Class Assignment] Regex and Output Files by Anonymous Monk
in thread [Class Assignment] Regex and Output Files by Hayest

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