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use strict;
use warnings;
...
    }
);

            Rate   _open  _regex _substr  _split _unpack
_open   265986/s      --    -53%    -55%    -57%    -70%
...
_substr 593788/s    123%      5%      --     -3%    -33%
_split  612001/s    130%      9%      3%      --    -31%
_unpack 881949/s    232%     56%     49%     44%      --