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:

Individual comments will be linked to in answers to questions

Answer 1

Language: Clojure
Library: Enlive (a selector-based (à la CSS) templating and transformation system for Clojure)

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Selector expression:

(def test-select
     (html/select (html/html-resource (java.io.StringReader. test-html)) [:a]))

Now we can do the following at the REPL (I've added line breaks in test-select):

user> test-select
({:tag :a, :attrs {:href "http://foo.com/"}, :content ["foo"]}
 {:tag :a, :attrs {:href "http://bar.com/"}, :content ["bar"]}
 {:tag :a, :attrs {:href "http://baz.com/"}, :content ["baz"]})
user> (map #(get-in % [:attrs :href]) test-select)
("http://foo.com/" "http://bar.com/" "http://baz.com/")

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You'll need the following to try it out:

Preamble:

(require '[net.cgrand.enlive-html :as html])

Test HTML:

(def test-html
     (apply str (concat [""]
                        (for [link ["foo" "bar" "baz"]]
                          (str "" link ""))
                        [""])))