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

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +ezio.melotti, michael.foord
stage:  -> test needed
type: behavior -> enhancement
versions:  -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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<http://bugs.python.org/issue20145>
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