Why not just store $$s in a local copy of $_?
#Either
local $_ = $$s;
#Or
s//$$s/; #tricky.. ;-)
Actually, in this case, I'd be tempted to alter your approach altogether and use a regex table.
sub lexer {
my ($parser) = shift;
my $s = $parser->YYData->{INPUT};
# I don't get your line: 'm/\G\s+/gc; skip any spaces'
my %dispatch = (
INT => qr/\G(\d+)/gc,
ID => qr/\G([A-Z]\w*)/gc,
#.. and so on ..
);
while (my ($key, $regex) = each %dispatch) {
return ($key, $1) if $$s =~ $regex;
}
}
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