python 正则表达式判断邮箱格式是否正确

import re

def validateEmail(email):

    if len(email) > 7:
        if ("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$", email) != None:
            return 1
    return 0