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use strict;
use warnings;
...
     index:  4 wallclock secs ( 4.55 usr +  0.00 sys =  4.55 CPU) @ 19
+79762.43/s (n=9000000)
     regex:  3 wallclock secs ( 3.68 usr +  0.00 sys =  3.68 CPU) @ 24
+48313.38/s (n=9000000)