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```
use Benchmark;

...
  }
}
});
```

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Benchmark: timing 100000 iterations of NoOpLoop, regex1, reverse, subs
+tr...
  NoOpLoop:  2 wallclock secs ( 1.86 usr +  0.00 sys =  1.86 CPU) 
...
             @ 13513.51/s (n=100000)
    substr:  8 wallclock secs ( 8.51 usr +  0.01 sys =  8.52 CPU) 
             @ 11737.09/s (n=100000)