Can you provide examples of parsing HTML?

Question

How do you parse HTML with a variety of languages and parsing libraries?

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When answering:

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Answer 1

Language: C#
Library: System.XML (standard .NET)

using System.Collections.Generic;
using System.Xml;

public static void Main(string[] args)
{
    List matches = new List();

    XmlDocument xd = new XmlDocument();
    xd.LoadXml("...");

    FindHrefs(xd.FirstChild, matches);
}

static void FindHrefs(XmlNode xn, List matches)
{
    if (xn.Attributes != null && xn.Attributes["href"] != null)
        matches.Add(xn.Attributes["href"].InnerXml);

    foreach (XmlNode child in xn.ChildNodes)
        FindHrefs(child, matches);
}