use strict;
use warnings;

use Benchmark q{cmpthese};

my $rsMatch = sub
   {
       my ($key, $val) = q{MYKEY=MYVAL=2} =~ /^([^=]*)=(.*)/s;
       return [$key, $val];
   };

my $rsSplit = sub
   {
       my ($key, $val) = split m{=(?=.*=)}, q{MYKEY=MYVAL=2};
       return [$key, $val];
   };

cmpthese(-5,
   {
      Match => $rsMatch,
      Split => $rsSplit
   });