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use strict;
use warnings;
...
   _regex       => \&_regex,
   }
   );

                  Rate       _split       _index _split_LIMIT       _r
+egex
_split        657900/s           --         -26%         -31%         
+-38%
_index        890097/s          35%           --          -7%         
+-17%
_split_LIMIT  952857/s          45%           7%           --         
+-11%
_regex       1066336/s          62%          20%          12%         
+  --