Here is some code to show the difference (perlvar as you quoted gives a good description): use strict;
use warnings;
my $plus;
my $N;
my $text = "abc123def";
my $text_match = qr/((\D+)(\d+))(?{ $plus = $+;$N = $^N })(\D+)/;
$text =~ $text_match;
print "$plus, $N\n";
$text_match = qr/(\D+)(\d+)(?{ $plus = $+;$N = $^N })(\D+)/;
$text =~ $text_match;
print "$plus, $N\n";
update:oh yeah the results: __END__
123, abc123
123, 123
-enlil
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