[ python-Bugs-1518406 ] re '\' char interpretation problem

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Bugs item #1518406, was opened at 2006-07-06 16:26
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Category: Regular Expressions
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: ollie oldham (ooldham)
Assigned to: Gustavo Niemeyer (niemeyer)
Summary: re '\' char interpretation problem

Initial Comment:
I've run across 2 problems having to do with '\' 
character problems with the re module.

Problem 1 does not match the re when it should have.
Problem 2 matches, when it should not have.

There is a short snippet of code attached that shows 
the problems I'm having, and the output as it occurs 
on my machine.

I'm running on Windows 2000
Python versions: 2.4b1 and 2.4.3c1 both act the same 
way.

Problem (1) : why does * work and not + ?
import re
rex = re.compile(r'[a-z]:\.*', re.IGNORECASE)
rey = re.compile(r'[a-z]:\.+', re.IGNORECASE)
path1 = r'D:\Logs'
print rex.match(path1) # Matches - as it should have.
print rey.match(path1) # FAILES to match - should have.

Problem 2) : match occurs on nonUncPath when it should 
not
import re
uncPath = r'\\someUNC\path'
nonUncPath = r'\nonUnc\path'
rew = re.compile('\\\\.+', re.IGNORECASE)
print rew.match(uncPath) # works as it should.
print rew.match(nonUncPath) # matches and it should 
NOT.


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