c:\test>junk91 junk.dat
Bare loop                             ## baseline
0.322973012924194
0.358 0.078 0 0

c:\test>junk91 junk.dat               ## +400% 
Add back: regex;
1.40799999237061
1.466 0.046 0 0

c:\test>junk91 junk.dat               ## +80%
Add back: regex; first push;
1.67599987983704
1.731 0.046 0 0

c:\test>junk91 junk.dat               ## +400%
Add back: regex; first push; second push;
2.94299983978271
2.932 0.124 0 0

c:\test>junk91 junk.dat              ## +150%
Add back: regex; first push; second push; shifts
3.2759997844696
3.369 0.015 0 0