Is it possible to do boolean assertions with raku regex?

Question

In the apocalypses, there are some words about boolean assertions:

<( code )>            # call code as boolean assertion

However, I cannot make it work.

say "9471" ~~ m:g/ (\d) <($0 > 5)> /

I expect to only match numbers greater than 5, but I get a compile error.

Which is the correct syntax (if exists), or any alternative to do some boolean assertion?

Answer 1

See Boolean condition check

$ raku -e 'say "9471" ~~ m:g/ (\d) <?{ $0 > 5 }> /'
(｢9｣
 0 => ｢9｣ ｢7｣
 0 => ｢7｣)