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$octets = encode("utf8", $string);

use Encode qw( encode );

...
$octets = encode("utf8", $string);
print("\$octets is ", length($octets), " bytes long: ");
print(octet_dump($octets),  "\n");

$string is 1 chars long: "\x{3C5}"
$octets is 2 bytes long: CF 85