using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		Regex re = new Regex(@"http://nppes\.viva-it\.com/.+\.zip");
		string data = "<a href=\"http://n...content-available-to-author-only...t.com/NPPES_Data_Dissemination_Mar_2012.zip\">Download the information as a ZIP</a>";

		Console.WriteLine(re.Match(data).Value);
	}
}