using require "profile" I found these results from changing code.
Do not read in to it to much I seem to get differnt results on the same
formatted text. The text I used was the test_file.rb and was not
preformatted to favor any code.

Also now that I think about it with debug mode on I call some methods
2 or 3 more times for each run of loop. This is done to display the
debuging data.

In t  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
-------------one_liner?

Before static regx
4.69     0.46      0.03      271     0.11     0.15  Object#one_liner?
After 
2.99     0.61      0.02      271     0.07     0.07  Object#one_liner?


---------------just_the_string_please  
before
8.96     0.40      0.06      332     0.18     0.21  Object#just_the_string_please
With hash of regx
9.23     0.38      0.06      332     0.18     0.30  Object#just_the_string_please
as constant regx
10.17     0.38      0.06      332     0.18     0.24  Object#just_the_string_please
as one regx instead of 4
7.27     0.31      0.04      332     0.12     0.15  Object#just_the_string_please
as one as a constant
6.90     0.34      0.04      332     0.12     0.15  Object#just_the_string_please
called in one location not 2
1.92     0.90      0.02      233     0.09     0.21  Object#just_the_string_please

---------Check_ends?
before
6.78     0.44      0.04      183     0.22     0.55  Object#check_ends?
constant regx
10.34     0.29      0.06      183     0.33     0.60  Object#check_ends?
match instead of slice
1.67     0.60      0.01      183     0.05     0.16  Object#check_ends?
constant regx
0.00     0.60      0.00      183     0.00     0.16  Object#check_ends?

---------in_both?
3.57     0.42      0.02      324     0.06     0.52  Object#in_both?
no loop one regx with $1 ref
3.85     0.45      0.02      330     0.06     0.12  Object#in_both?
regx as constant
1.92     0.52      0.01      330     0.03     0.03  Object#in_both?

------in_outs
1.96     0.46      0.01      186     0.05     1.40  Object#in_outs?
one regx no loop
0.00     0.38      0.00      186     0.00     0.11  Object#in_outs?
regx constant
0.00     0.38      0.00      186     0.00     0.05  Object#in_outs?

-----start_block
after some mucking 
8.26     0.60      0.10      639     0.16     0.45  Object#start_block?
did a match instead of a include?
6.50     0.79      0.08      639     0.13     0.56  Object#start_block?
the match regx is a constant
5.22     0.86      0.06      642     0.09     0.40  Object#start_block?

-----line clean up
contstant regx
0.00     0.35      0.00       62     0.00     0.16  Object#line_clean_up