using System;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    private static readonly Regex _regexCrLf = new Regex(@"\r\n|\n|\r");

    public static void Main()

    {

        var s = "タブ\tＣＲＬＦ\r\nＣＲ\rＬＦ\nＬＦＣＲ\n\rベル\a終了";

        Console.WriteLine("== 修正前 ==");

        Console.WriteLine(s);

        s = _regexCrLf.Replace(string.Join(string.Empty, from c in s where !char.IsControl(c) || c == '\n' || c == '\r' select c), "\n").Normalize();

        Console.WriteLine("== 修正後 ==");

        Console.WriteLine(s);

        Console.WriteLine("== コード ==");

        Console.WriteLine(string.Join(";", s.ToCharArray().Select(c => ((int)c).ToString("X4"))));

    }

}

​