gistfile1.rb

# -*- coding: utf-8 -*-

require 'rubygems'
require 'mechanize'

def google(query)
  agent = WWW::Mechanize.new
  agent.get 'http://www.google.com'
  agent.page.form_with(:name => 'f') do |form|
    form.field_with(:name => 'q').value = query
    form.click_button
  end
  agent.page
end

puts google('2 * 5').at('h2').content
#=> 2 * 5 = 10