Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
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.
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nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38660>
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