Benchmark: timing 1 iterations of by_regexp, by_split...
 by_regexp:  0 secs ( 0.00 usr  0.00 sys =  0.00 cpu)
            (warning: too few iterations for a reliable count)
Use of uninitialized value at ./bench2.pl line 14.
Use of uninitialized value at ./bench2.pl line 15.
Use of uninitialized value at ./bench2.pl line 19.
Use of uninitialized value at ./bench2.pl line 20.
  by_split:  0 secs ( 0.00 usr  0.00 sys =  0.00 cpu)
            (warning: too few iterations for a reliable count)