my $string = "firstname1:::surname1:::middlename1:::firstname2:::surname2:::middlename2:::firstname3:::surname3:::middlename3";

my @arr;


##</code><code>##

$arr[0] output:  firstname1:::surname1:::middlename1
$arr[1] output:  firstname2:::surname2:::middlename2
$arr[2] output:  firstname3:::surname3:::middlename3