markdownにはBlueClothを使えばいいみたいなんだけど。RedClothの3.0.4、4.0.1で確認。 require 'rubygems' # gem 'RedCloth', '< 4.0.0' require 'redcloth' require 'bluecloth' [RedCloth, BlueCloth].each do |c| puts c.to_s + " " + "-" * 60 puts c.n…