控制台，正则表达式

while (true)
            {
                Console.WriteLine("请输入合法手机号");
                string phone = Console.ReadLine();
                string patten = @"^[1]+[3-9]+\d{9}";
                if (Regex.IsMatch(phone, patten))
                {
                    Console.WriteLine("合法");
                }
                else
                {
                    Console.WriteLine("不合法");
                }
                Console.WriteLine("请输入邮箱");
                string email = Console.ReadLine();
                string yx = @"\w+@\w+.[a-z]{3}$";
                if (Regex.IsMatch(email, yx))
                {
                    Console.WriteLine("合法");
                }
                else
                {
                    Console.WriteLine("不合法");
                }
                Console.WriteLine("请输入IP地址");
                string ip = Console.ReadLine();
                string str = @"^((1?[1-9]\d?)|(1\d{2})|(2[0,1]\d)|(22[0-3]))(.((1?\d{1,2})|(2[0-4]\d)|(25[0-5]))){3}$";
                if (Regex.IsMatch(ip,str))
                {
                    Console.WriteLine("合法");
                }
                else
                {
                    Console.WriteLine("不合法");
                }
            }

验证如下: