fork download 
  1. using System;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using System.Linq;
  5. using System.Text.RegularExpressions;
  6.  
  7. public class Test
  8. {
  9. 	public static void Main()
  10. 	{
  11. 		var strs = new List<string> { "123", "(1234)", "1", "(33)", "(123", "123)"};
  12. 		var rx = new Regex(@"^(?<bracket>\()?\d+(?(bracket)\))$");
  13.         foreach (var s in strs)
  14.         	Console.WriteLine($"{s} => {rx.IsMatch(s)}");
  15. 	}
  16. }
Success #stdin #stdout 0.05s 19528KB
comments (?)
stdin 
Standard input is empty
stdout 
123 => True
(1234) => True
1 => True
(33) => True
(123 => False
123) => False
https://ideone.com/7HFSHW
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!