u may want to use regex to reduce / eliminate if checkings

i use newlisp, this is the code:

(set 'urls '(

"http://motors.shop.ebay.com/Parts-Accessories_Car-Truck-Part..."

"http://cgi.ebay.com/ebaymotors/FACTORY-15-Mercedes-E320-300E..."

"http://shop.ebay.com/items/__mini-cooper-rims?_trkparms=72%3..."))

(define (getKW url)

  (find {([^/|^_]*)(_W0QQ|\?)} url 1) ;find using regex

  $1) ;return the first matched string inside (bla*)

(map println (map getKW urls))

;f350-wheels-20

;FACTORY-15-Mercedes-E320-300E-OEM-Chrome-Wheels-Rims

;mini-cooper-rims