require "youtube_id/version"

module YoutubeID
  FORMATS = [
    %r((?:https?://)?youtu\.be/(.+)),
    %r((?:https?://)?(?:www\.)?youtube\.com/watch\?v=(.*?)(&|#|$)),
    %r((?:https?://)?(?:www\.)?youtube\.com/embed/(.*?)(\?|$)),
    %r((?:https?://)?(?:www\.)?youtube\.com/v/(.*?)(#|\?|$)),
    %r((?:https?://)?(?:www\.)?youtube\.com/user/.*?#\w/\w/\w/\w/(.+)\b)
  ]

  def self.from(video_url)
    video_url.strip!
    FORMATS.find { |format| video_url =~ format } and $1
  end
end