Renaming af filer

CSharp kode 

 class Program
     {
         private const string inputDir = @"C:\rename";
         private const string outputDir = @"C:\rename\renamed\";
         private const string prefix = "Anmeldelse ";
         static void Main(string[] args)
         {
             string[] fileNames = Directory.GetFiles(inputDir, "*.txt");
             string pattern = @"\b\d{4}\b";
             System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex(pattern);
 
             foreach(var fileName in fileNames)
             {
                 string shortFileName = Path.GetFileNameWithoutExtension(fileName).Replace("_", " ").Replace(".", " ");
                 string newFileName = "";
                 if (r.Matches(shortFileName).Count > 0 && Convert.ToInt16(r.Match(shortFileName).Value) > 1900 && Convert.ToInt16(r.Match(shortFileName).Value) < 2016)
                     newFileName = prefix +shortFileName.Replace(r.Match(shortFileName).ToString(), "") + " (" + r.Match(shortFileName) + ").ext";
                 else
                     newFileName = prefix + shortFileName + ".ext";
                 if (!File.Exists(outputDir + newFileName))
                     File.Copy(fileName, outputDir + newFileName);
             }
             Console.WriteLine("Slut prut");
         }
     }