safe_url.rb

  def make_safe_url(slug)
    slug = slug.downcase
    # strip html
    slug = slug.gsub(/<\/?[^>]*>/, "")
    # remove html entities
    slug = slug.gsub(/[^;\s]+;/, "")
    # remove non-word chars
    slug = slug.gsub(/[^\w\s]/, "")
    # change spaces to dashses
    slug = slug.gsub(/\s+/, "-")
    
    slug
  end