【python 正则表达式：太复杂了所以通过练习-1(电话号码-日期)】编写常见格式的字符串的正则表达式来由浅入深的认识它

import re
def match_phone_number(string):
    pattern = r"^(1[3-9]\d{9})$"
    match = re.match(pattern, string)
    if match:
        return True
    else:
        return False
string = "1234567"
print(match_phone_number(string)) # False
string = "13555555555"
print(match_phone_number(string)) # True

import re
from datetime import datetime

def match_date(string):
    pattern = r"^\d{8}$"  # 更正为8位数字
    match = re.match(pattern, string)
    if match:
        try:
            # 尝试将字符串转换为日期
            datetime.strptime(string, "%Y%m%d")
            return True
        except ValueError:
            return False
    else:
        return False
string = "20210101"
print(match_date(string)) # True
string = "19991231"
print(match_date(string)) # True