[C] Fscanf Question

[Marburg]

I'm having some troubles with what I think are called scansets.
This kind of stuff:

fscanf(fp, " %*[^0-9]%i %i/%i", &a, &b, &c);

So it ignores anything that's scanned in untill it sees a number.
That's all good, but I don't seem capable enough to get it to work with minuses as well (for a negative number.)

It would be great if someone could give me a hand, or maybe even write a little tutorial covering scansets (so maybe I could actually learn something.)

Thanks!