public decimal GetStringLastNumber(string str)

        {

            decimal result = 0;

            if (str != null && str != string.Empty)

            {

                Match match = Regex.Match(str, @"(^.+?)(\d+$)");

                if(match.Success)

                {

                    result = decimal.Parse(match.Groups[2].Value);

                }

            }

            return result;

        }