fcc-save-hook match only on To: field

[Eric Smith <es@xxxxxxxxxxxx>]

With the following simple entries:
fcc-save-hook name1 +mbox1
fcc-save-hook name2 +mbox2

If the email is Cc'ed to an address matching `name2',
then the mail is fcc-ed to mbox2.

I want to match either on the From: for the save-hook
or on the To: (and not Cc:) for the fcc-hook.
How do I do that?

(The regexes I tried did not work).

Thanks

-- 
Eric Smith