> Note that --match (and --matchfile) is ignored by doctests, so technically, it seems that it's doable ;-)

In test_os, --match works on doctest tests:

haypo@selma$ ./python -m test -v test_builtin --match=builtins.hex 
(...)
0:00:00 load avg: 0.28 [1/1] test_builtin
hex (builtins)
Doctest: builtins.hex ... ok

----------------------------------------------------------------------
Ran 1 test in 0.002s
(...)