Some code to grab Minecraft codes off reddit.

nibble.rb

require 'nibbler'
require 'open-uri'

CODE_RE = /[A-Za-z1-9]{4}-[A-Za-z1-9]{4}-[A-Za-z1-9]{4}/

class String
    [:gray, :red, :green, :yellow, :blue, :purple, :cyan, :white].each_with_index do |color, i|
        define_method color          do "\033[1;#{30+i}m#{self}\033[0m" end
        define_method :"#{color}ish" do "\033[0;#{30+i}m#{self}\033[0m" end
    end
end

class Link < Nibbler
  element 'a.title' => :title
  element './/div/p/a/@href' => :url
  element './/div/ul/li/a/@href' => :comments

  def minecraft_link?
    !!title[/minecraft.*codes?/i]
  end
end

class SubReddit < Nibbler
  elements '.link' => :links, :with => Link
end

gaming = SubReddit.parse open('http://www.reddit.com/r/gaming')

gaming.links.each do |link|
  if link.minecraft_link?
    puts "Found link: #{link.title.purple} - #{link.url.yellow}"

    link_codes = open(link.url).read.scan(CODE_RE)
    comment_codes = open(link.comments).read.scan(CODE_RE)

    # Some random stuff in the HTML matches the code regex. If it
    # doesn't have a number in it then it probably isn't a link.
    all_codes = (link_codes | comment_codes).select { |s| s =~ /\d/}

    all_codes.uniq.each do |code|
      puts "  #{code.green}"
    end
  end
end

How do you execute this?

have you figured it out??

I think you run it in Rudy IDE, you can try it out by downloading it and then do tell me if it worked.