Benchmark: running BigRE, Index, OptRE, m// loop, each for at least 10 CPU seconds...
     BigRE: 10 wallclock secs (10.63 usr +  0.00 sys = 10.63 CPU) @ 2025.69/s (n=21523)
     Index: 11 wallclock secs (10.47 usr +  0.00 sys = 10.47 CPU) @ 19019.11/s (n=199092)
     OptRE: 11 wallclock secs (10.51 usr +  0.00 sys = 10.51 CPU) @ 2702.33/s (n=28415)
  m// loop: 11 wallclock secs (10.45 usr +  0.00 sys = 10.45 CPU) @ 9593.84/s (n=100294)