python: 判断文件路径是否合法

import re

s = r'^(?P<path>(?:[a-zA-Z]:)?\\(?:[^\\\?\/\*\|<>:"]+\\)+)(?P<filename>(?P<name>[^\\\?\/\*\|<>:"]+?)\.(?P<ext>[^.\\\?\/\*\|<>:"]+))$'

file_dir = r'd:\asdf\sdf\sd.txt'

res = re.search(s, file_dir)
print(res)
if res:
    print(res.group())


# func
def isRulePath(file_path):
    re_path = r'^(?P<path>(?:[a-zA-Z]:)?\\(?:[^\\\?\/\*\|<>:"]+\\)+)' \
              r'(?P<filename>(?P<name>[^\\\?\/\*\|<>:"]+?)\.' \
              r'(?P<ext>[^.\\\?\/\*\|<>:"]+))$'
    path_flag = re.search(re_path, file_path)
    if path_flag:
        print(path_flag.group())
        rule_path = path_flag.group()
        return rule_path
    else:
        print("Invalid path")
        return False

print(isRulePath(file_dir))