redet(1) on Linux
The text 4a13492977a6, as Debian 5.0 (Lenny) shipped it.
regular expression development and execution tool
Flags it lists
-
-F -
-H -
-I -
-P -
-d -
-f -
-h -
-i -
-n -
-p -
-s -
-t -
-v