re正则表达式练习

判断变量名是否符合要求

import re 

names = ["name1","_name","2_name","__nam!12__","__name__"]

for name in names:
    ret = re.match("^[a-zA-Z_][a-zA-Z1-9_]*$",name)
    if ret:
        print("变量名%s符合要求"%ret.group())
    else:
        print("变量名%s非法"%name)

结果：

import re 

names = ["name1","_name","2_name","__nam!12__","__name__"]

for name in names:
    ret = re.match("^[a-zA-Z_][a-zA-Z1-9_]*$",name)
    if ret:
        print("变量名%s符合要求"%ret.group())
    else:
        print("变量名%s非法"%name)

判断邮箱是否为QQ，126，136的邮箱，@前4-20个字符

email = input("请输入邮箱：")

# 如果在正则表达式中出现普通字符？.等需要转译
ret = re.match("^([a-zA-Z_0-9]{4,20})@(163|126|qq)\.com$",email)
if ret:
    print("邮箱：%s符合要求"%ret.group(1))
else:
    print("邮箱：%s非法"%email)

结果：

请输入邮箱：[e-mail]
邮箱：123456符合要求

本文地址：https://blog.csdn.net/qq_28368377/article/details/107475795