畢桳栠摩琠敨映捡獴

def match(pattern, input): 
   m = re.compile(pattern).match(input)
   if m: return m.group(0)
   return False

def test(pattern): 
   match(pattern, 'Hello') == False
   match(pattern, 'Hello?') == 'Hello'
   match(pattern, 'Hello??') == 'Hello?'

>>> pattern = r"(.*?)(?<!!)[?]"
>>> match(pattern, 'hello')
False
>>> match(pattern, 'hello?')
'hello?'
>>> match(pattern, 'hello??')
'hello?'
>>> match(pattern, 'hello?!')
'hello?'
>>> match(pattern, 'hello!?')
False
>>> match(pattern, 'hello??!')
'hello?'
>>> match(pattern, 'hello? lol?')
'hello?'
>>>