using System;

using System.Text.RegularExpressions;

using System.Text;

​

public class Program

{

    public static void Main(string[]args)

    {

        var s = "a \nb" + Convert.ToString((char)0x1b) + Convert.ToString((char) 0x1e);

        byte[] ba = Encoding.Default.GetBytes(s);

        Console.WriteLine(s);

        Console.WriteLine(BitConverter.ToString(ba));

        s = Regex.Replace(s, @"\p{C}+", String.Empty);

        ba = Encoding.Default.GetBytes(s);

        Console.WriteLine();

        Console.WriteLine(s);

        Console.WriteLine(BitConverter.ToString(ba));

    }

}