string number = Console.ReadLine();
            Regex reg = new Regex(@"^[0-9]*$");
            Match m = reg.Match("");
            if (m.Success)
            {
                Console.WriteLine("yes");
            }
            else
            {
                Console.WriteLine("no");
            }
为什么我在控制台下输入回车，也输出yes

不以数字开头的字符串，回车当然也算