Regex game regression tester

regexen.rb

class Regexen
  def initialize(a={})
    a.default_proc = proc { |h,k| [] }
    @good = a[:good]
    @bad = a[:bad]
  end
  def good=(r)
    @good << r
  end
  def bad=(r)
    @bad << r
  end
  def to_s
    "Regexen.new good: #{@good}, bad: #{@bad}"
  end
  def check(r)
    @good.find {|b| not r.match(b)} or @bad.find {|b| r.match(b) }
  end
end