Stripping out non-numeric characters in string

Question

Hey Im looking to strip out non-numeric characters in a string in ASP.NET C#

So i.e 40,595 p.a.

would end up with 40595

Thanks

Answer 1

Use either a regular expression that's only capturing 0-9 and throws away the rest. A regular expression is an operation that's going to cost a lot the first time though. Or do something like this:

var sb = new StringBuilder();
var goodChars = "0123456789".ToCharArray();
var input = "40,595";
foreach(var c in input)
{
  if(goodChars.IndexOf(c) >= 0)
    sb.Append(c);
}
var output = sb.ToString();

Something like that I think, I haven't compiled though..

LINQ is, as Fredrik said, also an option