protected virtual void OnTitleReceived(object sender, ReceiveTitleEventArgs e);

      protected override void OnTitleReceived(object sender, ReceiveTitleEventArgs e)
      {
          base.OnTitleReceived(sender, e);
      }

Regex reg=new Regex(@"(?i)(public|protected)\svirtual\s(void)\s(\w+)\(((\w+)\s(\w+),\s\w+\s(\w+))?\);");

yourstr=reg.Replace(yourstr,"$1 override $2 $3($4)\r\n{\r\nbase.$3($6,$7)\r\n}");