using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        var passwords = new string[] {"Admin@123", "123#xxxx", "%%WERT32","aaaaa123456"};

        foreach(var pass in passwords){

            Console.WriteLine("Trying pass ("+pass+") ...");

            List<string> resultList = MeetsPasswordPolicy(pass);

            if(resultList == null || resultList.Count == 0)

                Console.WriteLine("No issues");

            else {

                Console.WriteLine("Found ("+resultList.Count+") issues");

                var res = string.Join(", ", resultList.ToArray());

                Console.WriteLine("-- "+res);

            }

            Console.WriteLine("-----------------------------------------");

        }

    }

    public static List<string> MeetsPasswordPolicy(string password)

        {

            var input = password;

            List<string> issues = new List<string>();

            var hasNumber = new Regex(@"[0-9]+");

            var hasUpperChar = new Regex(@"[A-Z]+");

            //var hasMiniMaxChars = new Regex(@".{8,15}");

            var hasMinChars = new Regex(@".{8,}");

            var hasLowerChar = new Regex(@"[a-z]+");

            var hasSymbols = new Regex(@"[!@#$%^&*()_+=\[{\]};:<>|./?,-]");

​

            if (!hasLowerChar.IsMatch(input))

                issues.Add("MustHasLowerChar");

            if (!hasUpperChar.IsMatch(input))

                 issues.Add("MustHasUpperChar");

            if (!hasMinChars.IsMatch(input))

                 issues.Add("MustHasMinChars");

            if (!hasNumber.IsMatch(input))

                 issues.Add("MustHasNumber");

            if (!hasSymbols.IsMatch(input))

                 issues.Add("MustHasSymbols");

​

            return issues;

        }

}