Reverse output of Oracle regexp_replace

Question

I've got a variable: v_NumInOne VARCHAR2(2342) := 234534564567

Then with the next line I've seperated it, using: (REGEXP_REPLACE((v_NumInOne), '(....)','\1 ' ));

The result: 2345 3456 4567

Now I'd like to reverse the output.

Expected result: 4567 3456 2345.