Benchmark: timing 1000 iterations of regexish, with_splitting...
  regexish: 59 wallclock secs (58.16 usr +  0.02 sys = 58.18 CPU) @ 17.19/s (n=1000)
with_splitting:  0 wallclock secs ( 0.02 usr +  0.00 sys =  0.02 CPU) @ 50000.00/s (n=1000)
            (warning: too few iterations for a reliable count)