parsing useragent string without get_browser

I've done a google and can't find anything on this. I want to parse a long list of useragent strings for a web analysis script I am writing. I could use get_browser, but firstly this would slow down my script quite a bit and secondly I am relying on the browscap.ini file of the newness of which is upto my ISP as I am on shared hosting. Is there are a way of doing this? I'd like to break down the string into it's componant parts but the difference in strings is big. eg- Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; stumbleupon.com 1.927) Windows-Media-Player/10.00.00.3650 Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4 Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/312.1 (KHTML, like Gecko) Safari/312 How do I start with this one?