Extract string from log file

[josephtys86 at googlemail.com]

203.114.10.66 - - [01/Aug/2008:05:41:21 +0300] "GET /stat.gif?
stat=v&c=F-Secure&v=1.1%20Build%2014231&s=av%7BNorton
%20360%20%28Symantec%20Corporation%29+69%3B%7Dsw%7BNorton
%20360%20%28Symantec%20Corporation%29+69%3B%7Dfw%7BNorton
%20360%20%28Symantec%20Corporation%29+5%3B%7Dv%7BMicrosoft%20Windows
%20XP+insecure%3BMicrosoft%20Windows%20XP%20Professional+f
%3B26027%3B26447%3B26003%3B22452%3B%7D&r=0.9496 HTTP/1.1" 200 43
"http://dfstage1.f-secure.com/fshc/1.1/release/devbw/1.1.14231/
card.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;
SV1; .NET CLR 2.0.50727)"



does anyone know how can i extract certain string from this log file
using regular expression in python or using XML. can teach me.