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From: Steinar Bang <sb@metis.no>
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Subject: Re: The <word>.<word>.<word> rule
Date: 14 May 2000 21:30:13 +0200
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>>>>> Karl Kleinpaste <karl@charcoal.com>:

>> How many false positives would you get if you match
>> <word>.<word>.[a-z][a-z] or
>> <word>.<word>.("com"|"net"|"org"|"mil")?

> Just for starters, you get false positives on _lots_ of mail
> addresses, including yours.

What if we match on
	[ \n\r\t]\w+\.\w+\.\("com"\|"net"\|"edu"\|"org"\|"mil"\)
?

What if we put all legal domains into that latter part?  Is that
possible or will all of those alternatives be one of the things that
drive the emacs regexp engine to its knees?