-X regex syntax? (repost)

[Vince LaMonica]

I hate to do this, but I am still stumped by this. Can anyone pass along a 
tip or two with regards to using -X?

Thanks,
/vjl/
[repost follows]:
Hi all,
I'm using GNU Wget 1.9.1 under Mac OS X, and I'm trying to confirm that I have 
the correct syntax for using the -X [or --exclude-directories] argument.

For example, I have a URL which I would like to wget with a -r. The URL 
contains many directories that are named, ".backup". I do not wish to download 
those directories. The way I've been attempting to do that is as follows:

wget -r --exclude-directories='*.backup*' --no-parent \ 
http://example.com/dir/stuff/

This does not appear to work. What is the proper syntax for wget's regex 
engine?

Thanks for any tips you can provide...
/vjl/