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'regex' => sub
{
...
{
     my @arr = $string =~ /(.{1,8})/og;
},

                 Rate split_pos  split grep_split substr_map substr_lo
+op unpack regex regexo
split_pos      7295/s        --   -57%       -60%       -68%        -7
+7%   -78% -100%  -100%
...
unpack        33495/s      359%    98%        84%        46%          
+4%     --  -99%   -99%
regex       4342185/s    59421% 25593%     23705%     18876%      1341
+1% 12864%    --    -6%
regexo      4596612/s    62909% 27098%     25099%     19988%      1420
+2% 13623%    6%     --