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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3f8b801e7e76 by R David Murray in branch '2.7':
backport: #20145: assertRaisesRegexp now raises a TypeError on bad regex.
http://hg.python.org/cpython/rev/3f8b801e7e76

New changeset 32407a677215 by R David Murray in branch '3.4':
backport: #20145: assert[Raises|Warns]Regex now raise TypeError on bad regex.
http://hg.python.org/cpython/rev/32407a677215

New changeset 8f72f8359987 by R David Murray in branch 'default':
Merge #20145 backport: delete whatsnew entry.
http://hg.python.org/cpython/rev/8f72f8359987

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