ANSI Color Codes in brief:

      0       to restore default color
      1       for brighter colors
      4       for underlined text
      5       for flashing text
     30       for black foreground
     31       for red foreground
     32       for green foreground
     33       for yellow (or brown) foreground
     34       for blue foreground
     35       for purple foreground
     36       for cyan foreground
     37       for white (or gray) foreground
     40       for black background
     41       for red background
     42       for green background
     43       for yellow (or brown) background
     44       for blue background
     45       for purple background
     46       for cyan background
     47       for white (or gray) background

you use the above codes together with an escape sequence like this (re
+place the '#' with the colour code of your choice) :

\e[#m

Once you've used an escape all subsequent text will be affected until 
+you use the reset escape

\e[0m

so if I want to format a part of a line of text, instead of:

print "This boring old line of text was supposed to have red text\n";

do this:

print "This new improved, brighter, more interesting line of text has 
+\e[31mred text\e[0m\n" ;

If you want to use two escapes on the same piece of text 
use one of these ';' :

\e[#;#m

print "This \e[5m new improved \e[0m, \e[5m brighter \e[0m, more 
\e[5minteresting \e[0m line of text has \e[31;5mflashing red 
text\e[0m\n" ;
[download]

\e[0m (the reset string) requires escaping in the regex, or at least the '\' and '[' do. In pseudo code the regex would read like this :

match anything (.*)
grab the rest up to \e[0m
[download]

try running it on the couple of the ANSI formatted strings I gave as examples and you'll see how it's working