....
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Ran 4 tests in 0.000s

OK
1
2
3
4
('empty', None, None, 'val')
None
<_sre.SRE_Match object at 0x7f34307ded30>
<_sre.SRE_Match object at 0x7f34307ded30>
Negation
<_sre.SRE_Match object at 0x7f34307ded30>