BTW: couldn't find an array holding the values of $1,$2,... in the perldocs !?!
Probably not much help in this particular case (and you still need to loop to capture), but 5.10 offers the %+ and %- predefined hashes for named captures (see perlvar) in place of an array of all capture groups:
>perl -wMstrict -le
"my $s = '12ab34cd56ef78';
my @pairs;
push @pairs, [ $+{A}, $+{B} ]
while $s =~ m{ (?<A>[[:alpha:]]) (?<B>[[:alpha:]]) }xmsg;
use Data::Dumper;
print Dumper \@pairs;
"
$VAR1 = [
[
'a',
'b'
],
[
'c',
'd'
],
[
'e',
'f'
]
];
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