Message 355793 - Python tracker

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Author	serhiy.storchaka
Recipients	ammar2, boris, ezio.melotti, mrabarnett, serhiy.storchaka
Date	2019-11-01.07:20:02
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1572592802.62.0.672249649115.issue38660@roundup.psfhosted.org>
In-reply-to

Content
These two regexes are not the same. >>> re.compile('([-_.a-zA-Z0-9]+)').match('ä') >>> re.compile(r'([-\w.]+)').match('ä') <re.Match object; span=(0, 1), match='ä'> As Ammar said checking that two regexes always matches the same is very difficult problem. It is the problem of determining if two programs are the same.

These two regexes are not the same.

>>> re.compile('([-_.a-zA-Z0-9]+)').match('ä')
>>> re.compile(r'([-\w.]+)').match('ä')
<re.Match object; span=(0, 1), match='ä'>

As Ammar said checking that two regexes always matches the same is very difficult problem. It is the problem of determining if two programs are the same.

History
Date	User	Action	Args
2019-11-01 07:20:02	serhiy.storchaka	set	recipients: + serhiy.storchaka, ezio.melotti, mrabarnett, ammar2, boris
2019-11-01 07:20:02	serhiy.storchaka	set	messageid: <1572592802.62.0.672249649115.issue38660@roundup.psfhosted.org>
2019-11-01 07:20:02	serhiy.storchaka	link	issue38660 messages
2019-11-01 07:20:02	serhiy.storchaka	create