scrub_html helper method

scrub_html_helper.rb

  # removes disallowed opening and closing html tags from a passed string
  def scrub_html(string)
    disallowed_tags = %w[p ul li ol blockquote cite pre code dl dt dd table tr th frameset from input select option address h1 h2 h3 h4 h5 h6]

    disallowed_tags.each do |tag|
      opening_tag = /<\s*#{tag}[^>]*>{1}/i
      closing_tag = /<\/\s*#{tag}\s*>/i
      hr_tag = /<\s*hr\s*\/*>/i
      string.gsub!(opening_tag, '')
      string.gsub!(closing_tag, '')
      string.gsub!(hr_tag, '')      
    end
    string
  end

  # rspec test
  it "should remove all disallowed opening and closing html tags" do
    text = "< p >I <  p>am <blockquote style='bold'>a </ p>test <ADDRESS STYLE='font-weight:bold'>string with <frameset>loads of </select>totally messed<hr>< hr >< HR><hr /><hr > up</p><h1> HTML. Please <cite style='bold'>help </H1>me.</p>"
    scrub_html(text).should == "I am a test string with loads of totally messed up HTML. Please help me."
  end