"qq" is a Perl operator that's called a "quote-like operator" that does the same thing as double-quotes with two differences:
- Any token can follow it (except whitespace) and it will match up to the next occurrence (or to a matching balanced token like {} or () or []).
- If you use a balanced token after it, it will grab everything up to the next, balanced close-token, so "qq{you can put {} inside}"