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Benchmark: timing 1000000 iterations of regexp, split, substr...
    regexp: 16 wallclock secs (16.27 usr +  0.03 sys = 16.30 CPU)
     split: 17 wallclock secs (15.88 usr +  0.00 sys = 15.88 CPU)
    substr:  6 wallclock secs ( 5.32 usr +  0.00 sys =  5.32 CPU)

 regexp: 17 wallclock secs (16.15 usr +  0.00 sys = 16.15 CPU)
     split: 15 wallclock secs (15.93 usr +  0.00 sys = 15.93 CPU)
    substr:  5 wallclock secs ( 5.37 usr +  0.00 sys =  5.37 CPU)