Regex

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

class ExtractHyperLinks
{
    static void Main(string[] args)
    {
        string text = string.Empty;
        string input = Console.ReadLine();
        while(input != "END")
        {
            text += input;
            input = Console.ReadLine();
        }

        string pattern = @"(?<=<a)(.+)\s?href\s*=\s*(""|')(.+?)(\2)";
        Regex hrefSearch = new Regex(pattern);
        MatchCollection matches = hrefSearch.Matches(text);
        foreach (Match match in matches)
        {
            Console.WriteLine(match.Groups[3].Value);
        }

    }
}