[ python-Bugs-1285809 ] re special sequence '\w'

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Bugs item #1285809, was opened at 2005-09-09 11:40
Message generated for change (Comment added) made by birkenfeld
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Category: None
Group: None
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Submitted By: ChristianJ (cybb20)
Assigned to: Nobody/Anonymous (nobody)
Summary: re special sequence '\w' 

Initial Comment:
>>> rexp = re.compile('\w', re.LOCALE)
>>> rexp.findall('_')
['_']
>>> '_'.isalnum()
False

While the Python docs say, that the underscore is 
supported, I strongly ask why this is so? 
The problem is that I want to match a sequence of 
alphanumeric characters but excluding the underscore.
If you defined \w to not support "_" anymore, people 
could easily check for the "_" as well with \w|_ .

My locale is "de_DE" but it does affect other locales as 
well.


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>Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-09-14 21:45

Message:
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user_id=1188172

\w matches the underscore since \w has been introduced in RE
syntax, and this was not in Python. This alone is sufficient
to justify this behavior.

Anyway, Python's behavior cannot change, too. Many REs would
become erroneous with such a change.

So closing as Won't fix.

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