...
----------------------------------------------------------------------
Ran 3 tests in 0.000s

OK
1
2
3
4
('empty', None, None, 'val')
None
<_sre.SRE_Match object at 0x7fe5a6243d30>
<_sre.SRE_Match object at 0x7fe5a6243d30>
Negation
<_sre.SRE_Match object at 0x7fe5a6243d30>