Extract Month and Date from File Name, using regx

string input = "ABC_V3_Weekly_Abcdef_from_NOV_05_to_NOV_12";
Regex regex = new Regex(@"from_(?<from_month>[A-Z]{3})_(?<from_day>[0-9]{2})_to_(?<to_month>[A-Z]{3})_(?<to_day>[0-9]{2})", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Multiline | RegexOptions.Singleline);
Match m = regex.Match(input);
if (m.Success)
{
    int year = 2014;   // You need to fix this part
    DateTime fromDate = new DateTime(year, int.Parse(m.Groups["from_month"].Value), int.Parse(m.Groups["from_day"].Value);
    DateTime toDate = new DateTime(year, int.Parse(m.Groups["to_month"].Value), int.Parse(m.Groups["to_day"].Value);

string from = String.Format("FromDate : {0}", fromDate.ToString("dd/MM/yyyy"));
string to = String.Format("ToDate : {0}", toDate.ToString("dd/MM/yyyy"));
}

String sval = "ABC_V3_Weekly_Abcdef_from_NOV_05_to_NOV_12";
           int Startvale = sval.IndexOf("_from_") + "_from_".Length;
          int EndValue = sval.IndexOf("_to");
          String FinalString = sval.Substring(Startvale, EndValue - Startvale);
             int monthInDigit = DateTime.ParseExact(FinalString.Substring(0, 3), "MMM", CultureInfo.InvariantCulture).Month;
             String result = FinalString.Substring(4, 2) + "/" + monthInDigit.ToString() + "/" + DateTime.Now.ToString("yyyy");
          MessageBox.Show(result.ToString())



          String result1 = sval.Substring(sval.Length-6);//Betweenas(sval, "_to_", "_to");