%rename("%(regex:/^([A-Z][a-z]+)+_(.*)/\2/)s", %$isenumitem) "";

%module FfeFooJava
%{
#include "foo.h"
}
// some typemaps here that use some C++ classes and C structures having suffix FFE
//.....

%include "foo.h"

%rename("%(regex:/^(FFE_)(.*)/\2/)s") "";

%(regex:/SWIG_p_f_p_([A-Za-z\d_]+)/PointerOn\1/)

SWIG_p_f_p_([A-Za-z\d_]+)
     ^            ^
     |            |
     |            |
     |            |
Generated prefix  |
                  |
                Character class allowing upper/lower cased letters,
                underscores, and digits inside class names.