Author LHampton
Recipients LHampton, docs@python, ezio.melotti, mrabarnett
Date 2020-03-22.17:55:41
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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
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Date User Action Args
2020-03-22 17:55:41LHamptonsetrecipients: + LHampton, ezio.melotti, mrabarnett, docs@python
2020-03-22 17:55:41LHamptonsetmessageid: <1584899741.37.0.154796453538.issue40043@roundup.psfhosted.org>
2020-03-22 17:55:41LHamptonlinkissue40043 messages
2020-03-22 17:55:41LHamptoncreate