ruby库 - nokogiri

介绍:
一个新的Ruby解析HTML/XML的ruby库

安装:

sudo apt-get install libxml2-dev libxslt1-dev
sudo gem install nokogiri

视频:
http://railscasts.com/episodes/190-screen-scraping-with-nokogiri

源码地址:
http://github.com/tenderlove/nokogiri/

demo(nokogiri_google.rb):

require 'rubygems'
require 'nokogiri'
require 'open-uri'

url = 'http://www.google.cn/search?q=tenderlove'
doc = Nokogiri::HTML(open(url))

doc.css('h3.r a.l').each do |link|
  puts link.content
end
puts '--------------------------------------------------'

doc.xpath('//h3/a[@class="l"]').each do |link|
  puts link.content
end
puts '--------------------------------------------------'

doc.search('h3.r a.l', '//h3/a[@class="l"]').each do |link|
  puts link.content
end