grammar ABC {
    token TOP { . "bc" . };
};

say ABC.parse("abcd");  # abcd

token TOP { . "bc" .+ };  # abcd  # .* is OK too

token TOP { .+ "bc" . };  # Any  # .* Any too

# error?
grammar ABC {
    token TOP { <noise> "bc" <noise> };
    token <noise> { . };
};