Ah, you're using /g... in that case I'd just...
use v5.12;
my $a = join '', map{ ('a'..'j')[rand 10] } 1 .. 1000;
while ($a =~ m[(aa..)]g)
{
next if pos($a) % 4;
say "Match at ", pos($a), ": ", $1;
}
It's possible that (?(cond)yes-expr|no-expr) might be able to do what you want, but I've not had much luck with that.
Update: with the hints about pos % 4 below, I've managed to get (?(cond)yes-expr|no-expr) to work. Not sure how well it goes performance-wise in practice, but:
use v5.12;
my $a = join '', map{ ('a'..'j')[rand 10] } 1 .. 1000;;
while ($a =~ m[(?(?{ pos() % 4 })(*F)|(aa..))]g)
{
say "Match at ", pos($a), ": ", $1;
}
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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