Json.Serialization.JsonFormatter.GetNextQuotedString C# (CSharp) Method

        private string GetNextQuotedString(string s, ref int pos)
        {
            string rv = string.Empty;
            int ns = s.IndexOf('\"', pos);
            if (ns != -1)
            {
                int nb = s.IndexOf('}', pos);
                if (nb == -1 || nb > ns)
                {
                    int ne = s.IndexOf('\"', ns + 1);
                    if (ne != -1)
                    {
                        rv = s.Substring(ns + 1, ne - ns - 1);
                        pos = ne + 1; // after ":
                    }
                }
            }
            return rv;
        }