import re phone_number = input("请输入11位号码:") # 以3个数字开头,4个数字结尾的一段数字 regenx = r"(?<=\d{3})\d{4}(?=\d{4})" # 将上面那段数字替换成4个* res = re.sub(regenx, "****", phone_number) print(res)