字符类

mport re

pattern = r"[A-Z][A-Z][0-9]"

if re.search(pattern, "LS8"):
   print("Match 1")

if re.search(pattern, "E3"):
   print("Match 2")

if re.search(pattern, "1ab"):
   print("Match 3")

结果：

>>>
Match 1
>>>