fork download 
  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6.     public static void Main()
  7.     {
  8.         string s = "AA_x0042_x005F_x00FF_x0043_BB";
  9.         foreach (Match match in Regex.Matches(s, "(?<!_x005F)_x(?!005F)[0-9A-F]{4}_"))
  10.         {
  11.             Console.WriteLine(match.Value);
  12.         }
  13.     }
  14. }
Success #stdin #stdout 0.04s 38192KB
comments ()
stdin 
Standard input is empty
stdout 
_x0042_
_x0043_
https://ideone.com/wF1Xd
language:
C# (gmcs 5.20.1)
created:
13 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!