Remove alphabets from a string

Question

I want to remove alphabets from a string. What is the best way to do it. To be more precise, i have MAC address of a system, and I want to extract only the numbers from it. I have found this article or stackoverflow. link text

I want to know, if using the regex is the best way or there are other ways to do it (maybe using LINQ).

Answer 1

To get the digits, you can use this regex:

var digits = Regex.Replace(text, @"\D", "");

\D matches anything that is not a digit, so removing those will give you the remaining digits.

Answer 2

The LINQ approach would be as follows:

string input = "12-34-56-78-9A-BC";
string result = new String(input.Where(Char.IsDigit).ToArray());

Non-LINQ / 2.0 approach:

string result = new String(Array.FindAll(input.ToCharArray(),
                    delegate(char c) { return Char.IsDigit(c); }));