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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 input = "aaaXaaaXaaaXaaaYXaaa";
  9.         string[] result = Regex.Split(input, "(?<!Y)X");
  10.         foreach (string s in result) {
  11.             Console.WriteLine(s);
  12.         }
  13.     }
  14. }
Success #stdin #stdout 0.07s 34072KB
comments (?)
stdin 
Standard input is empty
stdout 
aaa
aaa
aaa
aaaYXaaa
https://ideone.com/mqhEKN
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
secret

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