importredefis_valid_email(email):# 定义正则表达式pattern=r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'# 使用re.match进行匹配returnre.match(pattern,email)isnotNone# 测试邮箱地址test_emails=["example@domain.com","user.name@mail.co.uk","user_name123@sub.domain.org",...