Benchmark: timing 1000 iterations of child_grepping, child_perlizing, 
  inline_grepping, inline_perlizing...
child_grepping: 
  15 wallclock secs ( 0.17 usr  0.62 sys +  7.27 cusr  7.17 csys =  0.00 CPU)
child_perlizing: 
  90 wallclock secs ( 0.17 usr  0.60 sys + 75.91 cusr  6.87 csys =  0.00 CPU)
inline_grepping: 
  191 wallclock secs (177.97 usr +  7.64 sys = 185.61 CPU)
inline_perlizing: 
  66 wallclock secs (59.68 usr +  1.19 sys = 60.87 CPU)