首先来个简单的例子，利用Python实现匹配163邮箱的代码：

 

 

#-*- coding:utf-8 -*-
__author__ = '杨鑫'
import re
text = input("Please input your Email address：\n"):
if re.match(r'[0-9a-zA-Z_]{0,19}@163.com',text):
    print('Email address is Right!')
else:
    print('Please reset your right Email address!')

 

 

接着来一个匹配所有邮箱格式的代码：

 

#-*- coding:utf-8 -*-
__author__ = '杨鑫'
import re
text = input("Please input your Email address：\n")
if re.match(r'^[0-9a-zA-Z_]{0,19}@[0-9a-zA-Z]{1,13}\.[com,cn,net]{1,3}$',text):
#if re.match(r'[0-9a-zA-Z_]{0,19}@163.com',text):
    print('Email address is Right!')
else:
    print('Please reset your right Email address!')