using System;

public class Program

{

    public static void Main()

    {

        var test = Metadata.Parse("!!!EGSTAMP:orgid:labelid;S=100;DESCRIPTION=desc!!!");

        var test2 = Metadata.Parse("!!!EGSTAMP::labelid;DESCRIPTION=desc!!!");

        var test3 = Metadata.Parse("!!!EGSTAMP::labelid;S=12345;TEST=should oognore;DESCRIPTION=desc!!!");

        Console.WriteLine ("Parse complete.");

    }

}

​

public class Metadata

{

   public string OrganizationId { get; set; }

   public string LabelId { get; set; }

   public int Sensitivity { get; set; }

   public string Description { get; set; }

​

   public static Metadata Parse(string input)

   {

       // sanity checks

       if (input == null)

           throw new FormatException("Invalid metadata");

       if (!input.StartsWith("!!!EGSTAMP:"))

           throw new FormatException("Invalid metadata");

​

       var md = new Metadata();

       // split input string in to token and remove prefix and trailing !!!

       var tokens = input.Substring(11).TrimEnd('!').Split(';');

       foreach (var token in tokens)

       {

           // if token contains : we can assume its the orgid + labelId

           if (token.Contains (":"))

           {

               var parts = token.Split(':');

               md.OrganizationId = parts[0];

               md.LabelId = parts[1];

           }

           else if (token.Contains("="))           

           {

               // otherwise its an optional data fields using K=V

               var parts = token.Split('=');

               // once we've split we check the Key and if we understand it we set the correct property

               if (string.Equals(parts[0], "s", StringComparison.OrdinalIgnoreCase))

                   md.Sensitivity = int.Parse(parts[1]);                                                // SENSITIVITY

               else if (string.Equals(parts[0], "description", StringComparison.OrdinalIgnoreCase))

                   md.Description = parts[1];                                                           // DESCRIPTION

           }

       }

       return md;

   }

}