🚀 go-pugleaf

I am doing the following (in the scratch buffer):


(directory-files default-directory nil "*.[ch]")

and am getting back 

nil

where as there are files that match the reg-exp.

What am I doing wrong? 

I need the above for a macro which I want to write - 

'Replace all occurences of word "float" with word "double" in all the
*.c and *.h files in the current dirctory'

Is there a elisp macro which I can run in batch? Thanks in advance.
Anil
joshi@cs.uiuc.edu



-- 
"Whatever we wish ourselves to be, we have the power to make ourselves.  If what
we are now has been the result of our own past actions,then it certainly follows
that whatever we wish to be in the future, can be produced by our own present 
actions." - Vivekananda, Late Nineteenth Century Indian Philosopher