using System;

using System.Collections.Generic;

using System.Net.Http;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        var client = new HttpClient();

        var url = "https://ctv.modality.nl/track-and-trace/";

        var containerNumber = "TLLU 451629 1";

        containerNumber = Regex.Replace(containerNumber, @"\s+", "");

        if (!Regex.IsMatch(containerNumber, @"[A-Z]{4}\d{7}"))

            return;

        var container = $"{containerNumber.Substring(0,4)} {containerNumber.Substring(4,6)} {containerNumber[10]}";

        Console.WriteLine(container);

        if (!Regex.IsMatch(container, @"[A-Z]{4} \d{6} \d"))

            return;

        var formContent = new FormUrlEncodedContent(new[]

        {

            new KeyValuePair<string, string>("_qf__form", ""), 

            new KeyValuePair<string, string>("terminal", "CTV"),

            new KeyValuePair<string, string>("container", container),

        });

        var response = client.PostAsync(url, formContent);

        response.Wait();

        var content = response.Result.Content.ReadAsStringAsync();

        content.Wait();

        var pattern = @"(?:<b>PRESENT<\/b>.(?<PRESENT>[A-Z]\w+))(?:<br \/><b>STATUS<\/b>.(?<AVAILABLE>[A-Z]\w+)|.+)";

        var regex = new Regex(pattern);

        var match = regex.Match(content.Result);

        if (match.Success && match.Groups.Count > 1)

        {

            for(int i = 1; i < match.Groups.Count; i++)

            {

                var g = match.Groups[i];

                Console.WriteLine("Result: " + g.ToString());

            }

        }   

    }

}