1.写一个正则表达式判断一个字符串是否是ip地址

from re import *


def verify_ip(value: str):
    return fullmatch(r'((\d\d?|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d\d?|1\d\d|2[0-4]\d|25[0-5])', value)


v1 = verify_ip('255.189.10.37')
v2 = verify_ip('256.189.89.9')

print(v1)
print(v2)

2计算一个字符串中所有的数字的和 例如：字符串是：‘hello90abc 78sjh12.5’ 结果是90+78+12.5 = 180.5

from re import *

def numbers_sum(value: str):
    numbers_list = findall(r'\d+\.?\d*', value)
    sum_num = 0
    for number in numbers_list:
        sum_num += float(number)

    return sum_num
string = numbers_sum('hello90abc 78sjh12.5')
print(string)

3.验证输入的内容只能是汉字

while True:
    value = input('请输入要验证的内容:')

    str1 = fullmatch(r'[\u4e00-\u4f9a]+', value)

    if str1 is None:
        print('输入内容不合法，请输入汉字')

    else:
        break

4.电话号码的验证

tel = fullmatch(r'[1][0-9]{10}', '13557269820')
print(tel)