regexp(3tcl) on Linux
The text 05688702c427, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
Match a regular expression against a string
Flags it lists
-
-- -
-about -
-all -
-expanded -
-indices -
-inline -
-line -
-lineanchor -
-linestop -
-nocase -
-start