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  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 lst = new List<string> {"70707_70708_70709_display1.jpg",
  12. 			"70707_Front010.jpg",
  13. 			"626-this files is tagged.jpg",
  14. 			"1000x1000_webbanner2.jpg",
  15. 			"2000 years ago_files.jpg",
  16. 			"626gamingassets_styleguide.jpg" };
  17. 	        foreach (var s in lst) 
  18. 	        {
  19. 	        	var mcoll = Regex.Matches(s, @"^(?<v>\d{3,})(?:_(?<v>\d{3,}))*_")
  20. 	        		.Cast<Match>()
  21. 	        		.SelectMany(m => m.Groups["v"].Captures.Cast<Capture>().Select(c => c.Value))
  22. 	        		.ToList();
  23. 	        	if (mcoll.Count > 0)
  24. 	        		Console.WriteLine("Results: {0}", string.Join(", ", mcoll));
  25. 	        	else
  26. 	        		Console.WriteLine("No match: '{0}'", s);
  27. 	        }
  28. 	}
  29. }
Success #stdin #stdout 0.06s 133824KB
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stdin
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Standard input is empty
stdout
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Results: 70707, 70708, 70709
Results: 70707
No match: '626-this files is tagged.jpg'
No match: '1000x1000_webbanner2.jpg'
No match: '2000 years ago_files.jpg'
No match: '626gamingassets_styleguide.jpg'
https://ideone.com/aqIAxy
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
secret

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