$new .= "\n" while s/.$/ $new .= $&; '' /gem;
Did you test this?
$ time perl -e'
use Data::Dumper;
$Data::Dumper::Useqq = 1;
my $x = "123456789\n";
print Dumper $x;
my $new = ""; $new .= "\n" while $x =~ s/.$/ $new .= $&; '' /gem;
print Dumper $new;
'
$VAR1 = "123456789\n";
Out of memory!
real 1m54.230s
user 0m3.216s
sys 0m9.332s
BTW, my system has 32GB of RAM ouch!
Sorry, my mistake was leaving in the single quotes, oops.
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