[issue22364] Improve some re error messages using regex for hints

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is a patch for regex which makes some error messages be the same as in re with re_errors_2.patch. You could apply it to regex if new error messages look better than old error messages. Otherwise we could change re error messages to match regex, or discuss better variants.

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Added file: http://bugs.python.org/file38171/regex_errors.diff

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