Regular expression, "except end of string", question.

[Derek Basch]

In article <caqvac$t1s$1 at panix2.panix.com>, aahz at pythoncraft.com says...
> In article <MPG.1b3a8b592a44366a989682 at news-server.san.rr.com>,
> Derek Basch  <dbasch at yahoo.com> wrote:
> >
> >It always comforting to know that a really simple solution exists after 
> >you waste a couple of hours messing with Regular Expressions. :)
> 
> 'Some people, when confronted with a problem, think "I know, I'll use
> regular expressions."  Now they have two problems.' --Jamie Zawinski
> 

(?!...) 
Matches if ... doesn't match next. This is a negative lookahead 
assertion. For example, Isaac (?!Asimov) will match 'Isaac ' only if 
it's not followed by 'Asimov'.

That wasn't covered in my trusty (outdated) Python 2.1 Bible. I should 
have gone straight to the Library reference. Thanks.