C#: Extract A Href Links from Html Text

//  I know 1, 2, 3 is bad grouping name X(
private readonly static Regex LINK_REGEX = new Regex(
    @"<a\s+[^>]*href\s*=\s*(?:(?<3>'|"")(?<1>[^\3>]*?)\3|(?<1>[^\s>]+))[^>]*>(?<2>.*?)</a>",
    RegexOptions.IgnoreCase | RegexOptions.Compiled
);


public static void ExtractLinks(string text, ICollection<string> links)
{
    LINK_REGEX.ApplyAllMatched(text, (m) => links.Add(m.Groups[1].Value));
}

Helper method which processes matched string for each.

public static void ApplyAllMatched(this Regex regex, string text, Action apply)
{
    for (var m = regex.Match(text); m.Success; )
    {
        apply(m);
        m = m.NextMatch();
    }
}