[issue31969] re.groups() is not checking the arguments

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

No, it should not throw error that there is no any optional match.

It is not easy to check if there is optional match. For example, the pattern '(a)|(b)' contains optional matches, while the group in the pattern '()?' always matches.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31969>
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