5.024001
             Rate      regex      index filehandle      split
regex      9.65/s         --        -7%       -34%       -39%
index      10.4/s         8%         --       -29%       -34%
filehandle 14.6/s        51%        40%         --        -7%
split      15.7/s        63%        51%         8%         --