using System;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		string testStr = "|12||13||14|";
		var testMatch = Regex.Match(testStr, @"^(?:\|([0-9]+)\|)+$");
		int captureCtr = 0;
        foreach (Capture capture in testMatch.Groups[1].Captures) {
            Console.WriteLine("Capture {0}: {1}", captureCtr++, capture.Value);
        }
	}
}