Вытянуть значение из строки

{"acces_token" : "token" ,"expires_in":0,"user_id":id}

static void Main(string[] args)
        {
            string stroka = @"acces_token : 23sajb32y1uhdjsahdjh38uy4r38897df128fsfsadas ,expires_in:0,user_id:id";
 
            string pattern = @"acces_token : (\d+\w+\S+) ,";
 
            Match m = Regex.Match(stroka, pattern);
 
            Console.WriteLine(m.Groups[1].Value);
            Console.ReadLine();
        }

string pattern = @"acces_token *: *(\d+\w+\S+) *,"

@"""acces_token""[\s:]+""([\d\w]+)"""

string stroka = @"""access_token"":""23sajb32y1uhdjsahdjh38uy4r38897df128fsfsadas"",expires_in:0,user_id:id";
 
            string pattern = @"access_token"":""([\w\d\S]+)"",";
 
            Match m = Regex.Match(stroka, pattern);
 
            Console.WriteLine(m.Groups[1].Value);
            Console.ReadLine();

 HttpRequest req = new HttpRequest();
            HttpResponse resp;
            req.Cookies = new CookieDictionary();
            resp = req.Get("https://oauth.vk.com/token?grant_type=password&client_id=2274003&client_secret=hHbZxrka2uZ6jB1inYsH&username=****&password=*****");
            Console.WriteLine(resp);
            string res = resp.ToString();
            string pattern = @"access_token"":""([\w\d\S]+)"",";
            Match m = Regex.Match(res, pattern);
            Console.WriteLine(m.Groups[1].Value);
            Console.ReadLine();

string s = @"{""acces_token"" : ""23sajb32y1uhdjsahdjh38uy4r38897df128fsfsadas"" ,""expires_in"":0,""user_id"":id}";
            
            var t = Regex.Match(s, @"""acces_token""[\s:]+""([\d\w]+)""").Groups[1];
            Console.WriteLine(t);

string s = @"{""acces_token"" : ""23sajb32y1uhdjsahdjh38uy4r38897df128fsfsadas"" ,""expires_in"":0,""user_id"":id}";
            int start = s.IndexOf(":")+1;
            int end = s.IndexOf(",");
            string t = s.Substring(start, end - start).Replace("\"","").Trim();
            Console.WriteLine(t);

dynamic obj = JObject.Parse("{\"acces_token\" : \"ad8s432fa37s5d9f\" ,\"expires_in\":0,\"user_id\":0}");
Console.WriteLine(obj.acces_token);

HttpRequest req = new HttpRequest();
            HttpResponse resp;
            req.Cookies = new CookieDictionary();
            resp = req.Get("https://oauth.vk.com/token?grant_type=password&client_id=2274003&client_secret=hHbZxrka2uZ6jB1inYsH&username=**&password=**");
            Console.WriteLine(resp);
            string s = Convert.ToString(resp);
            JObject obj = JObject.Parse(s);
            Console.WriteLine(obj["acces_token"]);
            Console.ReadLine();
        }

HttpRequest req = new HttpRequest();
            HttpResponse resp;
            req.Cookies = new CookieDictionary();
            resp = req.Get("https://oauth.vk.com/token?grant_type=password&client_id=2274003&client_secret=hHbZxrka2uZ6jB1inYsH&username=**&password=**");
            Console.WriteLine(resp); 
            JObject obj = JObject.Parse(resp);
            Console.WriteLine(obj["acces_token"]);
            Console.ReadLine();
        }