Convert.ToDouble非数字字符串

Question

I want to extract the number out of a string that might contain non-numeric characters

I'm thinking Convert.ToDouble(Regex.Replace(data[i].ToString(), @"ANSWER HERE", ""));

Example string: "wd123.321dw" Want to get 123.321 out of that.

Also for negatives: "we-123.321ew" for -123.321

Any clues?

Answer 1

Something like this ?

        string n = "wd123.321dw";
        var regNumber = new Regex(@"\-?\d+\.?\d+");

        var match = regNumber.Match(n);
        if ( match.Success )
        {
            double d;
            if ( Double.TryParse(match.Value, out d) )
            {
                Console.WriteLine("The number is: {0}",d);
            }
        }

Answer 2

double d_val = Convert.ToDouble(Regex.Replace(data[i].ToString(), @"[^0-9\.\-]", ""));

Answer 3

Try this as your regular expression:

"0+" + Regex.Escape(CultureInfo.CurrentUICulture.NumberFormat.NumberDecimalSeparator) + "0+"

This will use the decimal separator of your current regional settings from Windows.