[issue27030] Remove deprecated re features

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Could Mailman be fixed? Undefined combinations of \ + ASCII emitted warnings in 3.5. And now they emit warnings even just in string literals (issue27364). If Mailman use undefined escape combinations, it could suffer from issue27364 too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27030>
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