# File formvalidator.rb, line 226
    def optional_regexp
      @form.keys.each do |elem|
        @profile[:optional_regexp].to_a.each do |regexp|
          regexp = Regexp.new(regexp)
          if elem =~ regexp
            @optional_fields << elem unless @optional_fields.include?(elem)
          end
        end
      end
      @optional_fields
    end