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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		string num = "5";
  9.         Console.WriteLine(Regex.Replace(num, @"\b\d\b", "0$&"));
  10.  
  11. 		num = "31";
  12.         Console.WriteLine(Regex.Replace(num, @"\b\d\b", "0$&"));
  13.  
  14. 		num = "a5b";
  15.         Console.WriteLine(Regex.Replace(num, @"(?<!\d)\d(?!\d)", "0$&"));
  16.  
  17. 	}
  18. }
Success #stdin #stdout 0.03s 30112KB
comments (?)
stdin
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Standard input is empty
stdout
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05
31
a05b
https://ideone.com/jExlKV
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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