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my ($key, $val) = 'MYKEY=MYVAL=2' =~ /^([^=]*)=(.*)/s;
my ($key, $val) = split m{=(?=.*=)}, q{MYKEY=MYVAL=2};

use strict;
use warnings;
...
      Match => $rsMatch,
      Split => $rsSplit
   });

         Rate Split Match
Split 26064/s    --   -8%
Match 28250/s    8%    --