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  1. using System;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using System.Linq;
  5. using System.Text.RegularExpressions;
  6.  
  7. public class Test
  8. {
  9. public static void Main()
  10. {
  11. string pattern = @"[.&@]+(?=.*@)";
  12. string input = "username@middle&something.else@company.com";
  13. string result = Regex.Replace(input, pattern, string.Empty);
  14. Console.WriteLine(result);
  15. }
  16. }
Success #stdin #stdout 0.03s 134592KB
stdin
Standard input is empty
stdout
usernamemiddlesomethingelse@company.com