using System;

using System.Collections;

using System.Collections.Generic;

using System.Net;

using System.IO.Compression;

using System.IO;

using System.Xml;

using System.Globalization;

using System.Text.RegularExpressions;

using System.Text;

using HtmlAgilityPack;

​

public class Program

{

    class DecompressGzipResponse : WebClient

    {

        protected override WebRequest GetWebRequest(Uri address)

        {

            HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);

            request.AutomaticDecompression = DecompressionMethods.GZip

                     | DecompressionMethods.Deflate;

            return request;

        }

    }

​

    private static string GetWebsite(string adress)

    {

        ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

        using (DecompressGzipResponse client = new DecompressGzipResponse())

        {

            client.Headers[HttpRequestHeader.UserAgent] = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36";

            client.Headers[HttpRequestHeader.Accept] = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

            client.Headers[HttpRequestHeader.AcceptLanguage] = "pl-PL,pl;q=0.8,en-US;q=0.6,en;q=0.4";

            client.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate, sdch, br";

            client.Headers[HttpRequestHeader.AcceptCharset] = "utf-8";

            HtmlDocument doc = new HtmlDocument();

            doc.LoadHtml(client.DownloadString(adress));

            return doc.DocumentNode.OuterHtml;

        }

    }

​

    private static List<string> ExtractId(String website)

    {

        List<string> toReturn = new List<string>();

        foreach (Match m in Regex.Matches(website, "\"g_3_.*?\""))

        {

            String v = m.Value;

            v = v.Replace("\"g_3_", "");

            v = v.Replace("\"", "");

            toReturn.Add(v);

        }

        return toReturn;

    }

    public static void Main()

    {

        string adress = @"https://www.flashscore.pl/koszykowka/usa/nba-1998-1999/wyniki/";

        string webSite = GetWebsite(adress);

        foreach(string s in ExtractId(webSite))

            Console.WriteLine(s);

        Console.WriteLine(webSite); 

    }

}