Subtraction/Intersection syntax

Does ORO support the subtraction/intersection functionality?

I  have been trying to use the following regular expression without
much success, for validating user-id's using the RFC-2486 standard.


^[^[[:ascii:]&&[:cntrl:]\u0020\\<>\"\[\].,;:@]]*$

Essentially, in the above expression, I am expecting to allow all
ascii characters except for control characters, space and any one of
those punctuation characters.

Any suggestions on how to implement this would be much appreciated.

Thanks.
.

To: [email protected]
Subject: 11.81; no preview images with cygwin tetex 3 xemacs 21.4.17 auctex 
11.81
X-Reporter-Void-Vars-Found: image-types
--text follows this line--

Remember to cover the basics.  Including a minimal LaTeX example
file exhibiting the problem might help.

preview latex works fine with tetex 2.02 but not tetex 3.0

Emacs  : XEmacs 21.4 (patch 17) "Jumbo Shrimp" [Lucid] (i686-pc-cygwin, 
Mule) of Tue May  3 2005 on w2kcikoas.