indices for more than one needle in Perl 6

Question

I want to find indices for more than one letter in a word. I don't want to use Regexes, because they will slow down the program (which is already slower than I wanted).

> "banana".indices(("a", "b").any)
any((1 3 5), (0))

How can I instead get 0, 1, 3, 5?

Answer 1

I would go for something like this (in the REPL):

> gather "banana".indices("a"|"b").deepmap: *.take
(1 3 5 0)