[issue39394] re: DeprecationWarning for `flag not at the start of expression` is cutoff too early

[Serhiy Storchaka]

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

This warning was introduced in 3.6. It is a time to convert it into an error. RE error messages contain position.

But I understand that very few users will use 3.11 in nearest future, so I am going to add a position to warning message and backport this change. It is not a bugfix in strong meaning, but I think it is safe to backport it.

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versions: +Python 3.10, Python 3.11 -Python 3.7, Python 3.8

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