add_text (Erubis::BiPatternEnhancer)

    # File lib/erubis/enhancer.rb, line 420
        def add_text(src, text)
          return unless text
          m = nil
          text.scan(@bipattern_regexp) do |txt, indicator, code|
            m = Regexp.last_match
            super(src, txt)
            add_expr(src, code, '=' + indicator)
          end
          #rest = $' || text                    # ruby1.8
          rest = m ? text[m.end(0)..-1] : text  # ruby1.9
          super(src, rest)
        end