Ruby: Strip HTML tags using Ruby

The StripHtml function strips all the HTML tags in the passed string but preserves the ones specified in the PreserveTags array.

	def StripHtml(str, PreserveTags = ['a','img','p','br','i','b','u','ul','li'])
	str = str.strip || ''
	PreserveArr = PreserveTags.join('|') << '|\/'
	str.gsub(/<(\/|\s)*[^(#{PreserveArr})][^>]*>/,'')
	end

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