$> BENCHMARK=5 perl subline.pl
                Rate         op   tybalt89      daxim    rlindex cur_strlen
op          536066/s         --        -0%       -22%       -66%       -86%
tybalt89    538753/s         1%         --       -22%       -66%       -86%
daxim       688615/s        28%        28%         --       -57%       -82%
rlindex    1585059/s       196%       194%       130%         --       -58%
cur_strlen 3749674/s       599%       596%       445%       137%         --