CODEWITHSUNDEEP
rubyregex
B Seven
B Seven

Reputation: 45941

What is a good way to extract a url within a url in Ruby?

Given url = 'http://www.foo.com/bar?u=http://example.com/yyy/zzz.jpg&aaa=bbb&ccc=ddd'

What is a good way to extract http://example.com/yyy/zzz.jpg?

EDIT: I would like to extract the second url.

Upvotes: 0

Views: 66

Answers (3)

the Tin Man
the Tin Man

Reputation: 160631

Using Ruby 2.0+:

require 'uri'

url = 'http://www.foo.com/bar?u=http://example.com/yyy/zzz.jpg&aaa=bbb&ccc=ddd'
uri = URI.parse(url)
URI.decode_www_form(uri.query).to_h['u'] # => "http://example.com/yyy/zzz.jpg"

For Ruby < 2.0:

require 'uri'

url = 'http://www.foo.com/bar?u=http://example.com/yyy/zzz.jpg&aaa=bbb&ccc=ddd'
uri = URI.parse(url)
Hash[URI.decode_www_form(uri.query)]['u'] # => "http://example.com/yyy/zzz.jpg"

The Addressable gem is very full-featured, and follows the specs better than URI. The same thing can be done using:

require 'addressable/uri'

url = 'http://www.foo.com/bar?u=http://example.com/yyy/zzz.jpg&aaa=bbb&ccc=ddd'
uri = Addressable::URI.parse(url)
uri.query_values['u'] # => "http://example.com/yyy/zzz.jpg"

Upvotes: 0

Pedro Lobito
Pedro Lobito

Reputation: 99061

require "uri"
URI.extract("text here http://foo.example.org/bla and here mailto:[email protected] and here also.")
# => ["http://foo.example.org/bla", "mailto:[email protected]"]

http://www.ruby-doc.org/stdlib-2.1.1/libdoc/uri/rdoc/URI.html

Upvotes: 3

Arup Rakshit
Arup Rakshit

Reputation: 118299

I'd do :-

require 'uri'

url = 'http://www.foo.com/bar?u=http://example.com/yyy/zzz.jpg&aaa=bbb&ccc=ddd'

uri = URI(url)
URI.decode_www_form(uri.query).select { |_,b| b[/^http(s)?/] }.map(&:last)
# => ["http://example.com/yyy/zzz.jpg"]
# or something like
Hash[URI.decode_www_form(uri.query)]['u'] # => "http://example.com/yyy/zzz.jpg"

Upvotes: 3

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