using System;

using System.Text.RegularExpressions;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string html = 

            @"<ul id=""minhas-tags"">

               <li><em>Tagged: </em></li>

                <li><a href=""/tags/tag1"">tag1</a>, </li>

                <li><a href=""/tags/tag2"">tag2</a>, </li>

                <li><a href=""/tags/tag3"">tag3</a>, </li>

                <li><a href=""/tags/tag4"">tag4</a>, </li>";

        Match[] tags = Regex.Matches(html, @"tags?\w+(?=</a>)")

                       .Cast<Match>()

                       .ToArray();

        foreach (var tag in tags) {

            Console.WriteLine(tag.Value);

        }

        Console.ReadLine();

    }

}