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  1. using System;
  2. using System.Text.RegularExpressions;
  3. using System.Text;
  4.  
  5. public class Test
  6. {
  7. public static void Main()
  8. {
  9. string s = "NEW ITEM:1_BELT:3_JEANS:1_BELT:1_SUIT 3 PCS:1_SHOES:1";
  10. var output = Regex.Replace(s, @"[^0-9]+", "");
  11. StringBuilder sb = new StringBuilder();
  12. foreach (var i in output)
  13. {
  14. sb.Append(":" + i);
  15. }
  16. Console.WriteLine(sb); // :1:3:1:1:3:1:1
  17. }
  18. }
Success #stdin #stdout 0.06s 34048KB
stdin
Standard input is empty
stdout
:1:3:1:1:3:1:1