I hate regular expressions!

So we're trying to match a pattern (which we will then split)

Expected format is tumb(with optional -d(## 1-20)-s(### 1-999))
Examples of valid entries are

tumb
tumb-d2-n50
tumb-d20-n369
tumb-d20-n999
tumb-d20
tumb-d5-

invalid example:
tumb-d50-n1959


After about an hour of me and another guy fighting php to amke this work, I've decided I hate php. :(

We were either not matching at all, matching tumb-d20 as tumb-d2 with a 0 at the end.

Anyone happen to be a regex master? :3