[Rails] Reg. Expression

Hi
.. somebody around who is easy with Reg. Exressions.
For me a nightmare.

I have to Validate this format: 0-0000 0000 and/or 0-0000 0000/0 and/or 0-0000 0000/00
Would be a great help..

I have got: (^\d-\d{4} \d{4}(/\d{2})?$)|(^I\d{8}$)|(^$)

tried:
validates :project_number, :format => { :with => /(^\d-\d{4} \d{4}(/\d{2})?$)|(^I\d{8}$)|(^$)/, :message => "Message"}

But that seems to be not valid.

Thanks

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