A bug in Python's regular expression engine?
Diez B. Roggisch
deets at nospam.web.de
Tue Nov 27 16:52:18 CET 2007
Just Another Victim of the Ambient Morality wrote:
> This won't compile for me:
> regex = re.compile('(.*\\).*')
> I get the error:
> sre_constants.error: unbalanced parenthesis
> I'm running Python 2.5 on WinXP. I've tried this expression with
> another RE engine in another language and it works just fine which leads
> to believe the problem is Python. Can anyone confirm or deny this bug?
It pretty much says what the problem is - you escaped the closing
parenthesis, resulting in an invalid rex.
Either use raw-strings or put the proper amount of backslashes in your
regex = re.compile(r'(.*\\).*') # raw string literal
regex = re.compile('(.*\\\\).*') # two consecutive \es, meaning an escaped
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