New submission from Serhiy Storchaka:
For now re.split doesn't split with zero-width regex. There are a number of
issues for this (issue852532, issue988761, issue3262, issue22817). This is
definitely a bug, but fixing this bug will likely break existing code which use
regular expressions which can match zero-width (e.g. re.split('(:*)', 'ab')).
I propose to deprecate splitting on possible zero-width regular expressions.
This expressions either not work at all as expected (r'\b' never split) or can
be rewritten to not match empty string ('(:*)' to '(:+)').
In next release (3.6) we can convert deprecation warning to the exception, an
then after transitional period change behavior to more correct handling
zero-width matches without breaking backward compatibility.
----------
components: Extension Modules, Regular Expressions
files: re_deprecate_split_zero_width.patch
keywords: patch
messages: 230843
nosy: ezio.melotti, mrabarnett, pitrou, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Deprecate splitting on possible zero-width re patterns
type: behavior
versions: Python 3.5
Added file: http://bugs.python.org/file37148/re_deprecate_split_zero_width.patch
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<http://bugs.python.org/issue22818>
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