rgxg(1) on Linux
The text f7b4ce2d0348, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
ReGular eXpression Generator
Flags it lists
-
-N -
-U -
-Z -
-b -
-h -
-l -
-m -
-s -
-u -
-z