Benchmark: running match, silly, substr, unpack, each for at least 1 CPU seconds...
     match:  3 wallclock secs ( 1.00 usr +  0.02 sys =  1.02 CPU) @ 180382.35/s (n=183990)
     silly:  4 wallclock secs ( 1.15 usr +  0.09 sys =  1.24 CPU) @ 17341.13/s (n=21503)
    substr:  2 wallclock secs ( 1.00 usr +  0.05 sys =  1.05 CPU) @ 944029.52/s (n=991231)
    unpack:  2 wallclock secs ( 1.02 usr +  0.06 sys =  1.08 CPU) @ 362192.59/s (n=391168)