问regex101.com中的Regex在mz c#代码中不工作。

EN

 class Program
    {
        static void Main(string[] args)
        {

            string input = Startup();
            GetMatched(input);
        }

        private static string Startup()
        {
            Console.WriteLine("Please enter string for regex match: ");
            string input = Console.ReadLine();
            return input;
        }

        private static void GetMatched(string input)
        {
            if (!string.IsNullOrWhiteSpace(input))
            {
                const string digitsRegex = "((?=.*\\d)(?=.*[A - Z])(?=.*\\W).{ 8,50000})";

                Regex regex = new Regex(digitsRegex, RegexOptions.CultureInvariant);
                string fieldData = input.ToString().Replace(" ", "");


                if (regex.IsMatch(fieldData))
                {
                    Console.WriteLine("Success!");
                    Console.ReadLine();
                }
                else
                {
                    Console.WriteLine("Failed!");
                    Console.ReadLine();
                    Startup();
                }
            }
        }
    }