Solving complex parsing tasks with RegexTreeer

//********************************************************************************************
//Author: Sergey Stoyan, CliverSoft.com
//        http://cliversoft.com
//        stoyan@cliversoft.com
//        sergey.stoyan@gmail.com
//        22 March 2008
//Copyright: (C) 2008, Sergey Stoyan
//********************************************************************************************
using System;
using System.IO;
using CliverSoft;

namespace Test
{
    class Test
    { 
        internal void Run()
        {
            //text to be parsed
            string page = File.ReadAllText("../../_pages/Products.html");

            process_product_list(page);
        }

        ///create CliverSoft.Parser intended for pages with product list
        Cliver.Parser product_parser = new Cliver.Parser("../../_config_files/Products.rgx");

        /// <summary>
        /// Treat the page with CliverSoft.Parser
        /// </summary>
        /// <param name="page">text to be parsed</param>
        void process_product_list(string page)
        {
            Cliver.GroupCapture gc = product_parser.Parse(page);

            foreach (Cliver.GroupCapture product in gc["Product"])
            {
                Console.WriteLine(">>>>>>>Product:>>>>>>>");
                
                Console.WriteLine("Brand: " + product.ValueOf("Brand", 0));
                Console.WriteLine("Name: " + product.ValueOf("Name", 0));
                Console.WriteLine("Description: " + product.ValueOf("Description", 0));
                Console.WriteLine("Price: " + product.ValueOf("Price", 0));
                
                Console.WriteLine("");
            }

            Console.WriteLine(">>>>>>>NextPageLink:>>>>>>>");

            Console.WriteLine(gc.ValueOf("NextPageUrl", 0));            

            //*********************************************************************************
            //example of use of shortcut methods 
            //*********************************************************************************            
            Console.WriteLine("\n\nNextPageUrl: " + gc.FirstValueOf("NextPageUrl"));
            
            Cliver.GroupCapture product2 = gc.LastOf("Product");
            Console.WriteLine("\n\nLast product:");
            foreach (string attribute in product2.Keys)
                Console.WriteLine(attribute + ": " + product2.FirstValueOf(attribute));                        

            //*********************************************************************************
            //example of possible but not efficient and not safe use:
            //not efficient because of getting a complete arrays for a single value,
            //not safe because of not-checking intermediate GroupCapture's for their existence
            //*********************************************************************************            
            Console.WriteLine("\n\nName of the first product: " + gc["Product"][0]["Name"][0].Value);

            //*********************************************************************************
            //example of more efficient but still not safe use
            //*********************************************************************************            
            Console.WriteLine("\n\nName of the first product: " + gc.FirstOf("Product").FirstValueOf("Name"));
        }
    }
}