Message 355982 - Python tracker

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Author	jacksonriley
Recipients	LewisGaul, abacabadabacaba, ezio.melotti, jacksonriley, malin, mrabarnett, serhiy.storchaka
Date	2019-11-04.22:02:29
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1572904949.22.0.183185261375.issue23692@roundup.psfhosted.org>
In-reply-to

Content
I've got a bit confused and am doubting myself - is the below output expected? >>> m = re.match('(?:()\|(?(1)()\|z)){1,2}(?(2)a\|z)', 'a') >>> m.groups() ('', '') >>> m = re.match('(?:()\|(?(1)()\|z)){1,2}(?(1)a\|z)', 'a') >>> m.groups() ('', None) The first pattern doesn't behave as I would (probably naively expect) given Matthew's explanation of this bug - wouldn't the bug cause the match to fail with {1,2} as well? Also, it seems odd that changing the condition in the if clause should change what gets captured. Anyone have any thoughts?

I've got a bit confused and am doubting myself - is the below output expected?
>>> m = re.match('(?:()|(?(1)()|z)){1,2}(?(2)a|z)', 'a')
>>> m.groups()
('', '')
>>> m = re.match('(?:()|(?(1)()|z)){1,2}(?(1)a|z)', 'a')
>>> m.groups()
('', None)

The first pattern doesn't behave as I would (probably naively expect) given Matthew's explanation of this bug - wouldn't the bug cause the match to fail with {1,2} as well?
Also, it seems odd that changing the condition in the if clause should change what gets captured.

Anyone have any thoughts?

History
Date	User	Action	Args
2019-11-04 22:02:29	jacksonriley	set	recipients: + jacksonriley, ezio.melotti, mrabarnett, abacabadabacaba, serhiy.storchaka, malin, LewisGaul
2019-11-04 22:02:29	jacksonriley	set	messageid: <1572904949.22.0.183185261375.issue23692@roundup.psfhosted.org>
2019-11-04 22:02:29	jacksonriley	link	issue23692 messages
2019-11-04 22:02:29	jacksonriley	create