Valid SharePoint File Or Folder Name

class Program

    {

        static Regex illegalPathChars = new Regex(@"^\.|[\x00-\x1F,\x7B-\x9F,"",#,%,&,*,/,:,<,>,?,\\]+|(\.\.)+|\.$", RegexOptions.Compiled);

        static void Main(string[] args)

        {

            string fileName = "/new%20file.txt";

            string validFileName = fileName;

            if (GetValidFileOrFolderName(ref validFileName))

                Console.WriteLine("A valid file or folder name for '{0}' is '{1}'.", fileName, validFileName);

            else

                Console.WriteLine("Could not get a valid file or folder name.");

        }

        public static bool GetValidFileOrFolderName(ref string path)

        {

            return GetValidFileOrFolderName(ref path, '_');

        }

        public static bool GetValidFileOrFolderName(ref string path, char replacementChar)

        {

            if (path == null)

                return false;

            path = illegalPathChars.Replace(HttpUtility.UrlDecode(path.Trim()), replacementChar.ToString());

            if (path.Length > 128)

            {

                path = path.Substring(0, 128);

                return GetValidFileOrFolderName(ref path, replacementChar);

            }

            return path.Length > 0;

        }

    }