Benchmark: running BigRE, Index, OptRE, m// loop, each for at least 10 CPU seconds...
     BigRE: 11 wallclock secs (10.56 usr +  0.00 sys = 10.56 CPU) @ 11690.90/s (n=123491)
     Index: 11 wallclock secs (10.61 usr +  0.00 sys = 10.61 CPU) @ 43921.29/s (n=465961)
     OptRE: 11 wallclock secs (10.59 usr +  0.00 sys = 10.59 CPU) @ 17239.59/s (n=182619)
  m// loop: 11 wallclock secs (10.50 usr +  0.00 sys = 10.50 CPU) @ 6825.71/s (n=71670)