Match undone in sparse tree

Question

Is there any expression that matches all undone TODO states in a sparse-tree search?

Meaning: what's the shortest expression I can write if I do C-c / m that renders the same results as C-c / t?

Answer 1

With a prefix argument (C-u) to exclude non-TODO headlines, matching -DONE will get you close (unless you have several different DONE states).

Answer 2

Missed/forgot, and it's in the manual, that the answer is simply /!