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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6. public static void Main()
  7. {
  8. string str = "123456789123456";
  9. string result = Regex.Replace(str, @"(?<=\d{3})\d(?=\d{3})", "x");
  10. Console.WriteLine(result);
  11. Console.ReadLine();
  12. }
  13. }
Success #stdin #stdout 0.06s 34840KB
comments ()
stdin
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Standard input is empty
stdout
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123xxxxxxxxx456
https://ideone.com/LOw7U4
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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