class String<\/div> def emphasize substrings<\/div> cleaned = [substrings].flatten.compact.uniq.map(&:strip).reject(&:empty?)<\/div> return self.clone if cleaned.empty?<\/div> returning to_s do |em|<\/div> cleaned.inject em do |s, sub|<\/div> s.gsub!(%r/(#{sub})/i, \'<em>\\1</em>\') || s<\/div> end<\/div> end<\/div> end<\/div>end<\/div> <\/div><\/pre><\/div>\n \n <\/div>\n\n