TIMTOWTDI (and likely a lot more than just these three)
use 5.018003;
use warnings;
use DP;
use Test::More tests => 3;
use Benchmark "cmpthese";
my $n = 100;
my $s = "AAAAAXXXXXXXAAAXXXXXAXXXXAAAAA" x 100;
my $A = "A" x 10000;
sub s_ger { $s =~ s{A\K([^A]+)(?=A)} {"A" x length
+ $1 }ger }
sub substr_ger { $s =~ s{A\K([^A]{1,10000})(?=A)}{substr $A, 0, length
+ $1 }ger }
sub split_join {
my @s = split m/A\K([^A]+)(?=A)/ => $s;
for ($_ = 1; $_ < $#s; $_ += 2) {
$s[$_] = "A" x length $s[$_];
}
join "" => @s;
}
is (s_ger (), "A" x 3000, "s//x/ger");
is (substr_ger (), "A" x 3000, "s//substr/ger");
is (split_join (), "A" x 3000, "split/join");
cmpthese (-2, {
s_ger => \&s_ger,
subst => \&substr_ger,
spljn => \&split_join,
});
->
$ perl test.pl
1..3
ok 1 - s//x/ger
ok 2 - s//substr/ger
ok 3 - split/join
Rate spljn s_ger subst
spljn 3330/s -- -2% -6%
s_ger 3405/s 2% -- -4%
subst 3550/s 7% 4% --
YMMV
Enjoy, Have FUN! H.Merijn