javascript - Validation for xxx-xxx-xxxx or (xxx)xxx-xxxx

Possible Duplicate:
A comprehensive regex for phone number validation

Whats the regex for

xxx-xxx-xxxx

or
(xxx)xxx-xxxx

I can create regex for the first one with

/^\d{3}-\d{3}-\d{4}$/

but how to add rule in this so it can also handle the second one?