[issue20145] unittest.assert*Regex functions should verify that expected_regex has a valid type

[Roundup Robot]

Roundup Robot added the comment:

New changeset ec556e45641a by R David Murray in branch 'default':
#20145: assert[Raises|Warns]Regex now raise TypeError on bad regex.
http://hg.python.org/cpython/rev/ec556e45641a

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nosy: +python-dev

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