using System;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

using Newtonsoft.Json;

​

public class Program

{

    public class ex1 {

        public string Title { get; set; }

        public string Comments { get; set; }

    }   

    public static void Main()

    {

        //string pattern = @"(\:\s"".*?("").*?"")";

        string pattern = @"""ObTenantId"":\s?""(.*?)""";

        var s = "{\"Header\":{\"ObTenantId\":\"6884ecbd-4b7f-4f3f-8d4e-88a32ec236d5\",\"QueueId\":\"1\",\"MessageType\":\"MessageBodyResponseCommon\"},\"Body\":{\"MovablePropertiesResponse\":[{\"IdOb\":\"2c93ad32-e036-11e9-910b-005056a21fb5\",\"InventoryNumber\":\"41012800000000000000000113\",\"IdRsm\":\"3764097\",\"Result\":\"Ok\",\"ErrorMessage\":null}],\"Organisation\":{\"Inn\":\"7721818162\",\"Kpp\":\"772101001\"},\"Result\":\"Ok\",\"ErrorMessage\":null},\"Signatures\":[]}";

        Regex regex = new Regex(pattern);

        foreach (Match match in regex.Matches(s))

        {

            Console.WriteLine(match.Groups[1].ToString());

            /*foreach(var groupItem in match.Groups)

            {

                Console.WriteLine(groupItem.ToString());

            }*/

        }

​

​

}