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  1. using System;
  2. using System.Text.RegularExpressions;
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		 var s = "[12345]";
  8. 	     var result = Regex.Replace(s, @"(\[\d+\])", @"$1".Insert(1, "0"));
  9.  
  10. 		 Match match = Regex.Match(s, @"(\[\d+\])");
  11.             if (match.Success) {
  12.                 var test = match.Value.Insert(1, "#");
  13.                 Console.WriteLine(test);
  14.             }
  15. 	}
  16. }
Success #stdin #stdout 0.07s 31256KB
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stdin
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Standard input is empty
stdout
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[#12345]
https://ideone.com/vyFykU
language:
C# (gmcs 5.20.1)
created:
7 days ago
visibility:
public

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