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use warnings;
use strict;
...
     regex:  2 wallclock secs ( 1.24 usr +  0.00 sys =  1.24 CPU) @ 80
+515.30/s (n=100000)
simple_split:  1 wallclock secs ( 0.75 usr +  0.00 sys =  0.75 CPU) @ 
+132978.72/s (n=100000)

$data = '';
Benchmark: timing 1000000 iterations of map_split, regex, simple_split
+...
...
     regex:  1 wallclock secs ( 0.54 usr +  0.00 sys =  0.54 CPU) @ 18
+48428.84/s (n=1000000)
simple_split:  0 wallclock secs ( 0.94 usr +  0.00 sys =  0.94 CPU) @ 
+1062699.26/s (n=1000000)