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             Rate _substr _unpack  _regex  _split
_substr 2187335/s      --    -11%    -16%    -20%
_unpack 2457294/s     12%      --     -6%    -10%
_regex  2612321/s     19%      6%      --     -4%
_split  2726283/s     25%     11%      4%      --

use strict;
use warnings;
...
        _regex  => sub { _regex() }
    }
);