I'm not sure if I understand this correctly - but I suspect that all you really need to do is split
Update: - looks like I obviously didn't even remotely understand what you were after, so just pretend I didn't post the below :)
my $string = "TXXXABCDGXXXCCCDTGYYYCCCYYYCC";
my @wanted = split /XXX|YYY/, $string;
@wanted = (
Is that what you were after?
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