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One of the examples for assertRaisesRegex(p) is wrong by one character.
Current is:
self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ$',
 int, 'XYZ')
The $ at the end is wrong because the actual error message is "ValueError: invalid literal for int() with base 10: 'XYZ'" (with a ``'`` at the end). Two options for fixing.
Option 1 - remove $
self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ',
 int, 'XYZ')
Option 2 - add '
self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ\'$',
 int, 'XYZ')
Same example is shown for assertRaisesRegex, so applies to both.
And for completeness...here's something you can run to see the error [couldn't figure out how to attach two files]:
import unittest
class MyTest(unittest.TestCase):
 def test_example(self):
 # this fails
 self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ$',
 int, 'XYZ')
 def test_option1(self):
 self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ',
 int, 'XYZ')
 def test_option2(self):
 self.assertRaisesRegexp(ValueError, 'invalid literal for.*XYZ\'$',
 int, 'XYZ')
unittest.main()

New changeset 4a714fea95ef by Terry Jan Reedy in branch '2.7':
Issue #18237: Fix assertRaisesRegexp error caought by Jeff Tratner.
http://hg.python.org/cpython/rev/4a714fea95ef
New changeset b3d19f0494e7 by Terry Jan Reedy in branch '3.3':
Issue #18237: Fix assertRaisesRegexp error caought by Jeff Tratner.
http://hg.python.org/cpython/rev/b3d19f0494e7 

I went with adding ' after changing '...' to "...".
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