> I've been re-reading A5 (regexen), and I was trying to work out how to
> incorporate a preprocessor into regex, without a separate lexer. I came
> to the conclusion that preprocessor commands are part of the whitespace
> in the higher layer of the grammer. So we just need to define the
> rul
I've been re-reading A5 (regexen), and I was trying to work out how to
incorporate a preprocessor into regex, without a separate lexer. I came
to the conclusion that preprocessor commands are part of the whitespace
in the higher layer of the grammer. So we just need to define the
rule appropri
