[issue43222] Regular expression split fails on 3.6 and not 2.7 or 3.7+

Change by Philip : -- resolution: -> wont fix stage: -> resolved status: open -> closed ___ Python tracker ___ ___

[issue43222] Regular expression split fails on 3.6 and not 2.7 or 3.7+

Serhiy Storchaka added the comment: There was a bug in the regular expression engine which caused re.split() working incorrectly with zero-width patterns. Note that in your example _DIGIT_BOUNDARY_RE.split("10.0.0") returns ['10.0.0'] on Python 2.7 -- the result which you unlikely expected.

[issue43222] Regular expression split fails on 3.6 and not 2.7 or 3.7+

New submission from Philip : I am receiving an unexpected behavior in using regular expressions for splitting a string. It seems like this error exists in `python 3.6` but not `python 2.7` and not `python 3.7+`. Below I have described a minimal example with `tox`. `setup.py` ``` from