元字符

import re

pattern = r"gr(a|e)y"

match = re.match(pattern, "gray")
if match:
   print ("Match 1")

match = re.match(pattern, "grey")
if match:
   print ("Match 2")    

match = re.match(pattern, "griy")
if match:
    print ("Match 3")

结果：

>>>
Match 1
Match 2
>>>