还是试着用 re 改写了下

long_string = "blablabl"

my_dict = {"a": "string1", "b": "string2" , "c": "string3", "d":"string4"}

patterns = {
r"(?=.*Andy)": "a";
r"(?=.*Jack)": "b",
r"(?=.*Jim)(?!.*Mike)": "c",
}

matches = [patterns[pattern_key] for pattern_key in patterns.keys() if re.search(pattern_key, long_string)]

if matches:
return my_dict[matches[0]]
else:
return my_dict["d"]

但是个人感觉还是不如 if ..else 直观