RubyでHTMLを解析する。(nokogiri)

nokogiri　を使って　RubyでHTMLを解析できます。
http://chaos-fractal.blogspot.com/2011/11/ruby.html


●例1

require 'rubygems'
require 'nokogiri'

doc = Nokogiri::HTML.parse(<<-eohtml)

  
    <title>Hello World</title>
  
  
    <h1>

This is an awesome document</h1>
I am a paragraph
        <a href="http://google.ca/">I am a link</a>
    


  

eohtml

####
# Search for nodes by css
doc.css('p > a').each do |a_tag|
  puts a_tag.content
end
####
# Search for nodes by xpath
doc.xpath('//p/a').each do |a_tag|
  puts a_tag.content
end

####
# Or mix and match.
doc.search('//p/a', 'p > a').each do |a_tag|
  puts a_tag.content
end

###
# Find attributes and their values
# doc.search('a').first['href']

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●例2

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

# Perform a google search
doc = Nokogiri::HTML(open('http://google.com/search?q=tenderlove'))

  puts doc
# Print out each link using a CSS selector
# doc.css('h3.r > a.l').each do |link|
 doc.css('h3').each do |link|
  puts link.content
end

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