This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

classification
Title: sre bug with nested groups
Type: Stage:
Components: Regular Expressions Versions:
process
Status: closed Resolution: fixed
Dependencies: Superseder:
Assigned To: effbot Nosy List: effbot, glchapman, mfx, niemeyer
Priority: normal Keywords:

Created on 2001-10-12 14:23 by mfx, last changed 2022-04-10 16:04 by admin. This issue is now closed.

Messages (3)
msg6905 - (view) Author: Markus F.X.J. Oberhumer (mfx) Date: 2001-10-12 14:23
sre incorrectly assigns non-matched inner groups.

See m.group(2) in the example below.

This bug seems to be present in all sre versions
(tested with python 1.6.x, 2.0.x, 2.1.x and 2.2a4).

Markus

P.S. this seems not related to SF bug #468169



Script started on Tue Oct  9 05:09:28 2001
mfx@laetitia:~/tmp > cat sre_bug.py
import sys, pre, sre

def time2ms(re, time):
    m = re.search(r"^((\d)\:)?(\d\d)\.(\d\d\d)$", time)
    print re.__name__
    if hasattr(re, "__version__"):
        print re.__version__
    print m.groups()

print sys.version
time2ms(pre, "34.123")
time2ms(sre, "34.123")

mfx@laetitia:~/tmp > pyhon2.2a4 sre_bug.py

2.2a4 (#1, Sep 29 2001, 23:40:47)
[GCC 2.95.4 20010902 (Debian prerelease)]
pre
(None, None, '34', '123')
sre
2.1.1
(None, '3', '34', '123')

Script done on Tue Oct  9 05:09:45 2001
msg6906 - (view) Author: Greg Chapman (glchapman) Date: 2002-03-11 13:51
Logged In: YES 
user_id=86307

I posted a patch (527371) for this here:

http://sourceforge.net/tracker/?
func=detail&aid=527371&group_id=5470&atid=305470
msg6907 - (view) Author: Gustavo Niemeyer (niemeyer) * (Python committer) Date: 2002-11-06 14:28
Logged In: YES 
user_id=7887

Fixed in CVS in the following revisions:

Lib/test/re_tests.py:1.30->1.31 
Lib/test/test_sre.py:1.37->1.38 
Misc/NEWS:1.511->1.512 
Modules/_sre.c:2.83->2.84

Thank you very much!
History
Date User Action Args
2022-04-10 16:04:31adminsetgithub: 35316
2001-10-12 14:23:33mfxcreate