Rename my animes and series to use Episode.Extension format

rename.rb

REGEX = /([0-9]{2,3}).*([\.mp4|\.mkv|.rmvb|.avi]{4,5})/

Dir['*'].each do |file_name|
  if (match = REGEX.match(file_name)) && File.exist?(file_name)
    new_name = "#{match[1]}#{match[2]}"
    File.rename(file_name, new_name)
  end
end