class String
  def to_permalink
    str = self.de_2_int
    str.gsub!(/'/, "")
    str.gsub!(/[^-\w\d]+/sim, "-")
    str.gsub!(/-+/sm, "-")
    str.gsub!(/^-?(.*?)-?$/, '\1')
    str.downcase!
    str
  end
end