Question

How to add spaces to a number every 4 digits in C#

Answer 1

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string cardNumber = "9003125334656789";
 
        string cardNumberWithSpaces = Regex.Replace(cardNumber, ".{4}", "$0 ");
 
        Console.WriteLine(cardNumberWithSpaces);
    }
}
 
 
/*
run:
   
9003 1253 3465 6789 
   
*/

 

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