question about rpmdbInitIterator()

[David Peterson]

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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