Getting attribute’s value in Nokogiri to extract link URLs

by 
html = <<HTML
  <div id="block">
    <a href="http://google.com">link</a>
  </div>
HTML
doc = Nokogiri::HTML(html)
doc.xpath('//div/a/@href')
#=> [#<Nokogiri::XML::Attr:0x80887798 name="href" value="http://google.com">]

Or if you wanna be more specific about the div:

>> doc.xpath('//div[@id="block"]/a/@href')
=> [#<Nokogiri::XML::Attr:0x80887798 name="href" value="http://google.com">]
>> doc.xpath('//div[@id="block"]/a/@href').first.value
=> "http://google.com"

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