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use Benchmark;
...
    str[i--] = '\0';
  }
}

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Benchmark: timing 1000000 iterations of inline, regex...
    inline:  4 wallclock secs ( 4.39 usr +  0.03 sys =  4.42 CPU)
     regex:  8 wallclock secs ( 6.84 usr +  0.03 sys =  6.87 CPU)