how to negate definitions?

[Crni Gorac]

I would like to have something like this in my Lex
file:

whtspc [ \t\n]
spcl [#\\]
%%
[^{whtspc}{spcl}] { do_something(); }
%%

But this of course doesn't work because curlies are
not special characters in character class. So I had to
instead use:

%%
[^ \t\n#\\] { do_something(); }
%%

What would be proper way to implement former? Thanks.

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