my regex line {
    ^^
    (\w+) :my $s; <?{ $s = %sigils{$0} }>
    \h+
    $s $<foo>=\N* $s # Note the foo bit here ...
    $$
}

is  ('bang !one!' ~~ m/<line>/)<line><foo>, 'one', 'is   bang!one'; # ... and here