question about rpmdbInitIterator()

[David Peterson <petersod@xxxxxxxxxx>]

Looking in rpmdb.h, I see the following
function:

    rpmdbMatchIterator rpmdbInitIterator(rpmdb
db, rpmTag rpmtag, const void* keyp, size_t keylen);

My question is, what is the set of valid
inputs that the function is supposed to
handle for the 'keyp' parameter?  For
instance, is a regular _expression_ for
matching package names ok, or is the
set of valid inputs more constrained
than that?

Thanks,
Dave
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