# File lib/erubis/preprocessing.rb, line 48
    def _decode(arg)
      arg = arg.to_s
      arg.gsub!(/%3C%25(?:=|%3D)(.*?)%25%3E/) { "<%=#{CGI.unescape($1)}%>" }
      arg.gsub!(/&lt;%=(.*?)%&gt;/) { "<%=#{CGI.unescapeHTML($1)}%>" }
      return arg
    end