class ActionDispatch::Http::ParameterFilter::CompiledFilter

def self.compile(filters)
  return lambda { |params| params.dup } if filters.empty?
  strings, regexps, blocks = [], [], []
  filters.each do |item|
    case item
    when Proc
      blocks << item
    when Regexp
      regexps << item
    else
      strings << item.to_s
    end
  end
  regexps << Regexp.new(strings.join('|'), true) unless strings.empty?
  new regexps, blocks
end