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use Benchmark;
...
                        $foo = reverse $foo;}
} );

Benchmark: timing 1000000 iterations of regex, unpack, xeger...
     regex:  6 wallclock secs ( 5.71 usr +  0.00 sys =  5.71 CPU) @ 17
+5131.35/s (n=1000000)
    unpack:  7 wallclock secs ( 5.91 usr +  0.00 sys =  5.91 CPU) @ 16
+9204.74/s (n=1000000)
     xeger:  9 wallclock secs ( 9.26 usr +  0.00 sys =  9.26 CPU) @ 10
+7991.36/s (n=1000000)