using System;

using System.IO;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

         var fileNames = new Dictionary<string, string>

            {

                {">myFile.txt", "myFile.txt"},

                {"<myFile.txt", "myFile.txt"},

                {@"PZTG-8013F3-2008A PT Asuransi Tri Pakarta (INDONESIA) - PT Gudang Garam Tbk (includin - Quota Share – IDR 64,219,783M - en-US - Reserve Change Only, PT Gudang Garam (Tuban), 6-Nov-2020, CR10389.pdf", 

                 @"PZTG-8013F3-2008A PT Asuransi Tri Pakarta (INDONESIA) - PT Gudang Garam Tbk (includin - Quota Share  IDR 64,219,783M - en-US - Reserve Change Only, PT Gudang Garam (Tuban), 6-Nov-2020, CR10389.pdf"},

                {@"PZTG-8013F3-2008A PT Asuransi Tri Pakarta (INDONESIA) - PT Gudang Garam Tbk (includin - Quota Share – IDR 64,219,783M - en-US - Reserve Change Only, PT G-Protected Data-, 6-Nov-2020, CR10389", 

                 @"PZTG-8013F3-2008A PT Asuransi Tri Pakarta (INDONESIA) - PT Gudang Garam Tbk (includin - Quota Share  IDR 64,219,783M - en-US - Reserve Change Only, PT G-Protected Data-, 6-Nov-2020, CR10389"}

            };

​

            foreach (var fileName in fileNames)

            {

                var cleanedFileName = CleanFileName(fileName.Key);

                if (string.Equals(cleanedFileName, fileName.Value))

                    Console.WriteLine("PASS - '{0}' => '{1}'.", fileName.Key, fileName.Value);

                else

                    Console.WriteLine("FAILED - Expected '{0}' but received '{1}'.", fileName.Value, cleanedFileName);

            }

    }

    public static string CleanFileName(string fileName)

    {

        return Regex.Replace(fileName, @"[^a-zA-Z0-9_.,\-\s]+", "");

        //return Path.GetInvalidFileNameChars().Aggregate(fileName, (current, c) => current.Replace(c.ToString(), string.Empty));

    }

}