def test_regular_number(self):
initial_value = re.match(r'\d+', '12')
expected_result = '13'
self.assertEqual(increment_match(initial_value), expected_result)
def test_starting_with_zero(self):
initial_value = re.match(r'[0]\d+', '012')
expected_result = '013'
self.assertEqual(increment_match(initial_value), expected_result)
