using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    private static Regex regex = new("^[A-Fa-f0-9]+$", RegexOptions.Compiled);

    private static Regex regex2 = new("^(0|[1-9][0-9]*)$", RegexOptions.Compiled);

    public static void Main()

    {

        var xtest= "375251234567";

        Console.WriteLine("Phone Valid = " + Regex.IsMatch(xtest, @"(\+)?(375)([2][59]|44)([0-9]+){7,7}"));

        var hex = BitConverter.ToString(new byte[]{0x00, 0x01}).Replace("-", "").ToLowerInvariant();

        var hexex = "47304402206486e07a38217a476069924af4a5aa72346d15ab8f6de1b0dad331f0881a348f02203e5a26052408179baa2a27fb835";

        var match = regex.IsMatch(hexex);

        var xt = new byte[] { 1, 128 };

        var cx = 0;

        Console.WriteLine("MD: " + xt[cx++]);

        Console.Write((char)xt[0]);

        Console.WriteLine((char)xt[1]);

        Console.WriteLine(System.Text.Encoding.ASCII.GetString(xt));

        var btest1  = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

        var btest2  = new byte[] { 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

        Console.WriteLine("T1" + btest1.SequenceEqual(btest2));

        var tx = 536870912u;

        var x = BitConverter.GetBytes(tx);

        x = x.Reverse().ToArray();

        Console.WriteLine(BitConverter.ToString(x).Replace("-", "").ToLowerInvariant());

        Console.WriteLine("aaaa".Length % 2 == 0);

        Console.WriteLine(hex);

        Console.WriteLine(hexex.Length);

        Console.WriteLine(match);

        Console.WriteLine(regex2.IsMatch("123123asdf"));

        ulong t1 = 11226028783092348819;

        Console.WriteLine(t1);

        List<string> t2 = null;

        t2?.ForEach(a => Console.WriteLine(a));

        Console.WriteLine(GetApiCache<Program>() == null);

        Console.WriteLine("done!");     

        var test = new byte[]{0xe2, 0x21, 0x0d, 0x00};

        var t = BitConverter.ToUInt32(test, 0);

        Console.WriteLine(t);

        var test2 = new byte[]{0xca, 0x01};

        var t3 = BitConverter.ToUInt16(test2, 0);

        Console.WriteLine(t3);

    }

    public static T? GetApiCache<T>()

    {

            return default(T);

    }

}