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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.       Console.WriteLine((new Regex(@"^\d+$")).IsMatch("123") ? "Yes" : "No");
  9.   }
  10. }
Success #stdin #stdout 0.07s 37200KB
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stdin
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Standard input is empty
stdout
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Yes
https://ideone.com/MZryl
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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