fork(23) download
copy 
  1. using System;
  2. using System.Text.RegularExpressions;
  3. using System.IO;
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		var data = new string[] {"(123) 556-7890", "123 556 7890", "(123) 556- 7890"};
  9. 		foreach (var s in data) {
  10. 			Console.WriteLine(Regex.Replace(s, @"\d(?!\d{0,3}$)", "X"));
  11. 		}
  12. 	}
  13. }
Success #stdin #stdout 0.1s 24296KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
(XXX) XXX-7890
XXX XXX 7890
(XXX) XXX- 7890
https://ideone.com/pC9Adj
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!