Another trick that works is to capture the split characters, which places them also in @fields and makes pos advance beyond them. Since all but probably the last group match, the normal split results mostly don't contain anything, so we need to filter out false elements with grep:
my $string = join '', a..z;
my @fields = grep {$_} split /(.{3})/, $string;
print "@fields\n";
__END__
abc def ghi jkl mno pqr stu vwx yz
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