Message 364812 - Python tracker

➜

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.

Author	LHampton
Recipients	LHampton, docs@python, ezio.melotti, mrabarnett
Date	2020-03-22.17:55:41
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1584899741.37.0.154796453538.issue40043@roundup.psfhosted.org>
In-reply-to

Content
Hello, There may be a bug in the implementation of the Conditional Construction of Regular Expressions, namely the (?(id/name)yes-pattern\|no-pattern). In the Regular Expression documentation (https://docs.python.org/3.7/library/re.html), in the portion about the Conditional Construct, it gives this sample pattern '(<)?(\w+@\w+(?:\.\w+)+)(?(1)>\|$)' and states that the pattern WILL NOT MATCH this string '<user@host.com'. In my tests the pattern MATCHES the string. I agree that the pattern should not match. Respectfully, Leon

Hello,
There may be a bug in the implementation of the Conditional Construction of Regular Expressions, namely the (?(id/name)yes-pattern|no-pattern).
In the Regular Expression documentation (https://docs.python.org/3.7/library/re.html), in the portion about the Conditional Construct, it gives this sample pattern '(<)?(\w+@\w+(?:\.\w+)+)(?(1)>|$)' and states that the pattern WILL NOT MATCH this string '<user@host.com'. In my tests the pattern MATCHES the string.
I agree that the pattern should not match.
Respectfully,
Leon

History
Date	User	Action	Args
2020-03-22 17:55:41	LHampton	set	recipients: + LHampton, ezio.melotti, mrabarnett, docs@python
2020-03-22 17:55:41	LHampton	set	messageid: <1584899741.37.0.154796453538.issue40043@roundup.psfhosted.org>
2020-03-22 17:55:41	LHampton	link	issue40043 messages
2020-03-22 17:55:41	LHampton	create