# File lib/ramaze/helper/formatting.rb, line 138
      def auto_link(text, opts = {})
        html_options = ' ' + opts.map{|k,v| "#{k}='#{v}'"}.join(' ') if opts.any?
        text.gsub(AUTO_LINK_RE) do
          all, a, b, c, d = $&, $1, $2, $3, $4
          if a =~ /<a\s/i # don't replace URL's that are already linked
            all
          else
            text = b + c
            text = yield(text) if block_given?
            %(#{a}<a href="#{b=="www."?"http://www.":b}#{c}"#{html_options}>#{text}</a>#{d})
          end
        end
      end