+=head2 C<reh_config>
+
+A typedef'd struct that holds a set of all the different callbacks publicized by this module.
+It has the following members :
+
+=over 4
+
+=item *
+
+C<comp>
+
+A function pointer of type C<reh_comp_hook> that will be called each time a regnode is compiled.
+Allowed to be C<NULL> if you don't want to call anything for this phase.
+
+=item *
+
+C<exec>
+
+A function pointer of type C<reh_exec_hook> that will be called each time a regnode is executed.
+Allowed to be C<NULL> if you don't want to call anything for this phase.
+
+=back
+