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  1. using System;
  2. using System.Linq;
  3. using System.IO;
  4. using System.Text.RegularExpressions;
  5.  
  6. public class Test
  7. {
  8. public static void Main()
  9. {
  10. var myLetter = "y";
  11. var str = " modif-i-ed a-im y-i-eld";
  12. var res = Regex.Replace(str, @"(\B[a-z](?=-))|-?[a-z]-",
  13. m => m.Groups[1].Success ? m.Groups[1].Value : myLetter);
  14. Console.WriteLine(res);
  15. }
  16. }
Success #stdin #stdout 0.11s 24904KB
stdin
Standard input is empty
stdout
 modifyed  yim  yyeld