bregex(8) on Linux
The text 5e5744a82fb2, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
Bacula's 'regex' engine
Flags it lists
-
-? -
-d -
-dt -
-f -
-l -
-n