pcretest(1) on Linux
The text 6dfca5007341, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
a program for testing Perl-compatible regular expressions.
Flags it lists
-
-C -
-S -
-b -
-d -
-dfa -
-help -
-i -
-m -
-o -
-p -
-q -
-t -
-tm