Added public files
Roughly added all public files. Probably missed some, though.
diff --git a/doc/hook/regexp_package b/doc/hook/regexp_package
new file mode 100644
index 0000000..ae52e3f
--- /dev/null
+++ b/doc/hook/regexp_package
@@ -0,0 +1,23 @@
+SYNOPSIS
+ #include <sys/driver_hooks.h>
+ #include <sys/regexp.h>
+
+ set_driver_hook(H_REGEXP_PACKAGE, value)
+
+ <value> being an integer:
+ 0
+ RE_PCRE
+ RE_TRADITIONAL
+
+DESCRIPTION
+ Optional hook to select the default regexp package to use
+ for regular expression functions.
+
+ If set to 0, the default package determined by the driver's
+ configuration/commandline options is used.
+
+HISTORY
+ Introduced in LDMud 3.3.595.
+
+SEE ALSO
+ hooks(C), default_prompt(H), invocation(D), regexp(C)