regex.search("^(?=ab(de))(abd)(e)", "abde").groups() returns (None, 'abd', 'e') instead of ('de', 'abd', 'e')

[GoogleCodeExporter]

regex.search("^(?=ab(de))(abd)(e)", "abde").groups() returns (None, 'abd', 'e') instead of ('de', 'abd', 'e')

[GoogleCodeExporter]

There's an compatibility problem with this one.

When talking about the re module in Python tracker issue #725149, msg15568, it 
says:

"""it would be better to move toward compatibility 
with pre (which after all was the official Python regex engine 
before sre), rather than to remain partly compatible with Perl."""

and regex is supposed to be compatible with the re module.

Otherwise, I'd agree with you.

Perhaps it's time to forget about 'pre' and just follow Perl, if that's what 
other regex implementations do.

Original comment by [email protected] on 14 Jan 2012 at 1:19

[GoogleCodeExporter]

I think that there isn't an compatibility problem with this one, because it 
seems that Python 3.2.2 and 2.7.2 default re library doesn't have this issue.

>>> import re
>>> print(re.search("^(?=ab(de))(abd)(e)", "abde").groups())
('de', 'abd', 'e')
>>>

Original comment by [email protected] on 14 Jan 2012 at 1:44

[GoogleCodeExporter]

You're right, it should be doing it.

Original comment by [email protected] on 14 Jan 2012 at 2:23

[GoogleCodeExporter]

Fixed in regex 0.1.20120114.

Original comment by [email protected] on 14 Jan 2012 at 10:53

• Changed state: Fixed