string_extension_for_ruby1.9.rb

module StringExtensions
  def remove_html_tags()
    self.gsub(/<.+?>/, "")
  end
  
  # clear unsafe char with url slug
  def safe_slug(spliter = '-')
    @slug = self
    if @slug.blank?
      Guid.new
      @slug = Guid.generate      
    end
    @slug.gsub(/[^a-zA-Z\-0-9]/,spliter).downcase  
  end
end

String.send :include,StringExtensions

Ruby1.9.2 > "aaa".remove_html_tags()
Ruby1.9.2 > "aaa".safe_slug