Testing 11, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //string pattern = "(Mr\\.? |Mrs\\.? |Miss |Ms\\.? )";
            //string[] names = { "Mr. Henry Hunt", "Ms. Sara Samuels", "Abraham Adams", "Ms. Nicole Norris" };
            
            //foreach (string name in names)
                //Console.WriteLine(Regex.Replace(name, pattern, String.Empty));
                
            string numero =  "A203";
            
            var Characters = @"/[`~!@#$%^&*()_|+\-=?;:',.<>\{\}\[\]\\\/]/gi";
            //string cadena = Regex.Replace(numero, Characters, String.Empty);
            string cadena = numero.Replace(Characters, String.Empty).Trim();
            
            //string pattern = @"^[0-1](\.[a-zA-Z])?$";
            //string pattern = @"^[0-1]+$"; // Número Binario
            string pattern = @"^[0-9]+$"; // Número Decimales
            Regex Val = new Regex(pattern);
            
            if(Val.IsMatch(numero))
            {
                Console.WriteLine("El Número: {0}",numero+" es Binario.");
            } else {
                Console.WriteLine("El Número no es Binario.");
            }
            
            // Conversiones Binarias
            int bin = 11111;
            int dec = 31;
            String hex = "1f";
            int res = 0;
            String result = "";
            
            // Convertir de Binario a Decimal
            res = Convert.ToInt32(bin.ToString(),2);
            Console.WriteLine("");
            Console.WriteLine("El Número Decimal es: {0}",res.ToString());
            
            
            // Convertir de Binario a Hexadecimal
            result = Convert.ToString(Convert.ToUInt32(bin.ToString(), 2), 16).ToUpper();
            Console.WriteLine("");
            Console.WriteLine("El Número Hexadecimal es: {0}",result);
            
            /*
            // Convertir de Decimal a Hexadecimal
            res = Convert.ToInt32(dec.ToString(),16);
            result = Convert.ToString(res, 16);
            Console.WriteLine("");
            Console.WriteLine("El Número Hexadecimal es: {0}",result);
            */
            
            // Convertir de Decimal a Binario
            int res1 = Convert.ToByte(dec.ToString(),16);
            Console.WriteLine("");
            Console.WriteLine("El Número Binario es: {0}",res1.ToString());
            
            // Convertir de Hexadecimal a Binario
            string pattern1 = @"^[0-9A-Fa-f]+$"; // Número Decimales
            Regex exp = new Regex(pattern1);
            if(exp.IsMatch(hex))
            {
                result = Convert.ToString(Convert.ToInt32(hex,16), 2);
                Console.WriteLine("");
                Console.WriteLine("El Número Binario es: {0}",result);
            } else {
                Console.WriteLine("");
                Console.WriteLine("El Número no es Hexadecimal.");
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,17 sec, cpu time: 0,17 sec, average memory usage: 17 Mb, average nr of threads: 4