C#判断是否为合法的email地址

题目要求: class Program { static void Main(string[] args) { Console.WriteLine("请输入正确的邮箱地址,以 @sina.com 结尾"); string us =Convert.ToString(Console.ReadLine()); string str1 = us.Replace("@", ""); int count = us.Length – str1.Length; string str2 = us.Replace(".", ""); int count2 = us.Length – s