http://d.hatena.ne.jp/UDONCHAN/20100503/1272898848

results.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'uri'
require 'open-uri'

class Results

  @l = nil
  @cache = nil

  def initialize
    c = open('cache', 'r')
    begin
      @l = Marshal.load(c.read)
    rescue Exception
      @l = Hash::new
    ensure
      c.close
    end
  end

  def open_cache?
    @cache != nil
  end

  def open_cache
    @cache = open('cache', 'wb') unless open_cache?
  end
  protected :open_cache

  def write_cache
    open_cache
    @cache.puts(Marshal.dump(@l))
  end
  protected :write_cache

  def close
    @cache.close if open_cache?
  end

  def results(q)
    if @l[q] == nil
      @l[q] = open(URI.parse(URI.encode("http://www.google.gr/search?hl=en&q=#{q}")), 'User-Agent' => 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.4) Gecko/20100413 Firefox/3.6.4').read.scan(/Results <b>1<\/b> - <b>10<\/b> of about <b>(.*)<\/b> for <b>/).first.first.gsub(',', '').to_i
      write_cache
    end
    @l[q]
  end
end

r = Results::new
puts r.results('沢城みゆき')
r.close