string content = @"Utilization (% of port capacity)                    7.30                  17.98
                    Utilization(% of port capacity)                    5.60                  20.98
                    Utilization(% of port capacity)                    5.80                  98.65";
            Regex reg = new Regex("\\s+(\\d{1,2}\\.\\d{2})\\s+(\\d{2}\\.\\d{2})");
            if (reg.IsMatch(content))
            {
                MatchCollection matches = Regex.Matches(content, "\\s+(\\d{1,2}\\.\\d{2})\\s+(\\d{2}\\.\\d{2})");
                foreach (Match item in matches)
                {
                    string A = item.Groups[1].ToString();
                    string B = item.Groups[2].ToString();
                    double C = Convert.ToDouble(A) + Convert.ToDouble(B);
                    MessageBox.Show(C.ToString());
                }
            }
            else
            {
                MessageBox.Show("未匹配到~");
            }