[issue40016] Clarify flag case in `re` module

[Ram Rachum]

Change by Ram Rachum <ram at rachum.com>:


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keywords: +patch
pull_requests: +18434
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19078

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40016>
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