Just to immortalize my chatterbox fumblings, let me suggest this:

my @matches;
foreach ( split "foo", $string) {
    push @matches, $1 if /(.*)tarbar/;
}
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grabs all the (stuff)s, each of which is guaranteed not to contain "foo". If you don't want "tarbar"s embedded in the (stuff)s you get, make that a non-greedy match.

Philosophy can be made out of anything. Or less -- Jerry A. Fodor