using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var stringComHexadecimais = "13-00-00-00-73-63-63-64-5C-73-63-63-64-5F-61-78-74-72-65-65-30-30-31-13-00-00-00-73-63-63-64-5F-61-78-74-72-65-65-30-30-31-5F";

        var padrao = @"13-00-00-00-(([0-9a-fA-F]{2}-){19})";

        var re = new Regex(padrao, RegexOptions.IgnoreCase);

        var matches = re.Matches(stringComHexadecimais);

        foreach (Match match in matches) 

        {

            Console.WriteLine("Match: " + match.Value);

            foreach (var groupRe in match.Groups) 

            {

                Console.WriteLine("Group: " + groupRe);

            }

        }

    }

}