> For the US, I have: /\d{5}(-\d{4})?/, but I don't know whether
> any digit combination is allowed - does the format allow for
> leading 0s?

Yes, leading zeroes are OK, because otherwise you couldn't sing

That's Zoom,
Zee Double-O Em
Box 354
Boston Mass
Oh two one three four
Send it to Zoom!

xoa

-- 
'Andy Lester        [EMAIL PROTECTED]
 Programmer/author  petdance.com
 Daddy              parsley.org/quinn   Jk'=~/.+/s;print((split//,$&)
                            [unpack'C*',"n2]3%+>\"34.'%&.'^%4+!o.'"])

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