Java 8/9: Can a character in a String be mapped to its indices (using streams)?

Question

Given a String s and a char c, I\'m curious if there exists some method of producing a List list from s (where

Answer 1

...Or in java-9:

Stream.of("Hello world!")
            .map(Scanner::new)
            .flatMap(s -> s.findAll("l"))
            .map(mr -> mr.start())
            .forEach(System.out::println);