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my $string = "firstname1:::surname1:::middlename1:::firstname2:::surna
+me2:::middlename2:::firstname3:::surname3:::middlename3";

my @arr;

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