int index1550 = dataIndexOf1550; int index1310 = dataIndexOf1310; int index980 = dataIndexOf0980; int index1610 = dataIndexOf1610; if index1550 = 0 int index = index1550 - 1;

public Tuple<string, double> ParseData(string data) { string[] units = { "1550", "1310", "0980", "1610" }; foreach (string unit in units) { int index = data.IndexOf(unit); if (index >= 0) { int start = index - 1; while (start >= 0 && data[start] >= '0' && data[start] <= '9') { start--; } start++;

        int end = index + unit.Length;
        while (end < data.Length && data[end] >= '0' && data[end] <= '9')
        {
            end++;
        }

        if (double.TryParse(data.Substring(start, end - start), out double value))
        {
            return Tuple.Create(unit, value);
        }
    }
}

return null;

}

// Usage: Tuple<string, double> result = ParseData("Some data with 1550 value"); if (result != null) { string unit = result.Item1; double value = result.Item2; // Do something with unit and value }