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: Racket

Library: (planet ashinn/html-parser:1) and (planet clements/sxml2:1)

(require net/url
         (planet ashinn/html-parser:1)
         (planet clements/sxml2:1))

(define the-url (string->url "http://stackoverflow.com/"))
(define doc (call/input-url the-url get-pure-port html->sxml))
(define links ((sxpath "//a/@href/text()") doc))

Above example using packages from the new package system: html-parsing and sxml

(require net/url
         html-parsing
         sxml)

(define the-url (string->url "http://stackoverflow.com/"))
(define doc (call/input-url the-url get-pure-port html->xexp))
(define links ((sxpath "//a/@href/text()") doc))

Note: Install the required packages with 'raco' from a command line, with:

raco pkg install html-parsing

and:

raco pkg install sxml