12:50 >perl 1846_SoPW.pl
Benchmark: timing 5 iterations of use_qr, use_re, use_str...
    use_qr: 57 wallclock secs (53.19 usr +  0.06 sys = 53.25 CPU) @  0.09/s (n=5)
    use_re: 22 wallclock secs (22.03 usr +  0.00 sys = 22.03 CPU) @  0.23/s (n=5)
   use_str: 26 wallclock secs (25.81 usr +  0.00 sys = 25.81 CPU) @  0.19/s (n=5)
        s/iter  use_qr use_str  use_re
use_qr    10.7      --    -52%    -59%
use_str   5.16    106%      --    -15%
use_re    4.41    142%     17%      --

12:54 >