[ python-Bugs-1518453 ] '\' problem in re.sub

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Bugs item #1518453, was opened at 2006-07-06 18:03
Message generated for change (Comment added) made by bos
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Category: Extension Modules
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: ilan29 (ilan29)
Assigned to: Nobody/Anonymous (nobody)
Summary: '\' problem in re.sub

Initial Comment:
#! /usr/bin/env python
import re

# Pattern only to match character 'b'
p = re.compile('b')

# Replace 'b' with SINGLE literal backslash
print p.sub( '\\', 'b', 1 )


I'm running:
   Python 2.4.3 (#1, Jun 11 2006, 12:01:42) 
   [GCC 3.3.4 (pre 3.3.5 20040809)] on linux2

When starting the progam it raises:
sre_constants.error: bogus escape (end of line)


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Comment By: Bryan O'Sullivan (bos)
Date: 2006-07-06 23:21

Message:
Logged In: YES 
user_id=28380

Your code is wrong.  Both Python and re interpret
backslashes, and you're not passing enough backslashes in
for re to see two.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1518453&group_id=5470