Message 347933 - Python tracker

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Author	bsaner
Recipients	bsaner
Date	2019-07-14.19:27:30
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1563132450.99.0.557456146194.issue37594@roundup.psfhosted.org>
In-reply-to

Content
(Sorry for the title; not quite sure how to summarize this) SO! Have I got an interesting one for you. ISSUE: In release 3.7.3 (and possibly later), the re module, if one has a string e.g. 'a.b.', a pattern such as '\.$' will successfully match* any number of multiple trailing periods. HOWEVER, when attempting to substitute those with actual character(s), it chokes. See attached poc.py NOTES: - This is a regression from 2.6.6, 2.7.16, and 3.6.7 (other releases were not tested). This behaviour does not occur on those versions.

(Sorry for the title; not quite sure how to summarize this)

SO! Have I got an interesting one for you.

ISSUE:
In release 3.7.3 (and possibly later), the re module, if one has a string e.g. 'a.b.', a pattern such as '\.*$' will successfully *match* any number of multiple trailing periods. HOWEVER, when attempting to substitute those with actual character(s), it chokes. See attached poc.py

NOTES:
- This *is a regression* from 2.6.6, 2.7.16, and 3.6.7 (other releases were not tested). This behaviour does not occur on those versions.

History
Date	User	Action	Args
2019-07-14 19:27:31	bsaner	set	recipients: + bsaner
2019-07-14 19:27:30	bsaner	set	messageid: <1563132450.99.0.557456146194.issue37594@roundup.psfhosted.org>
2019-07-14 19:27:30	bsaner	link	issue37594 messages
2019-07-14 19:27:30	bsaner	create