youtube patern

	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
	#https://github.com/reu/youtube_id/blob/master/lib/youtube_id.rb

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