Ok if we include MoreUtils we could use part which does what I wanted without an explicit while:
DB<41> use List::MoreUtils "part"
DB<42> $a=join " ",0..5
DB<43> x part {my $i++/2} $a =~/(\w) (\w)/g
0 ARRAY(0x90c6430)
0 0
1 1
1 ARRAY(0x90c68a0)
0 2
1 3
2 ARRAY(0x90c68b0)
0 4
1 5
but after considering MoreUtils it's only a small step to define a specialized functional solution fold (&) on one's own...
grep { } fold { $a =~/(\w) (\w)/g }.
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