Question

If I have a string of data with numbers in it. This pattern is not consistent. I would like to extract all numbers from the string and only a character that is defined as allowed. I thought RegEx might be the easiest way of doing this. Could you provide a regex patter that may do this as I think regex is voodoo and only regex medicine men know how it works

eg/

"Q1W2EE3R45T" = "12345"
"WWED456J" = "456"
"ABC123" = "123"
"N123" = "N123" //N is an allowed character

UPDATE: Here is my code:

var data = Value.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
data = data.Select(x => Regex.Replace(x, "??????", String.Empty)).ToArray();

Answer 1

String numbersOnly = Regex.Replace(str, @"[^\d]", String.Empty);

Using Regex.Replace(string,string,string) static method.

Sample

To allow N you can change the pattern to [^\dN]. If you’re looking for n as well you can either apply RegexOptions.IgnoreCase or change the class to [^\dnN]