compile_filter

# File actionpack/lib/action_dispatch/http/parameter_filter.rb, line 51
      def compile_filter
        strings, regexps, blocks = [], [], []

        @filters.each do |item|
          case item
          when NilClass
          when Proc
            blocks << item
          when Regexp
            regexps << item
          else
            strings << item.to_s
          end
        end

        regexps << Regexp.new(strings.join('|'), true) unless strings.empty?
        [regexps, blocks]
      end