Let me see if I can help. Just going to give you some variation of what I have used and see if one of them does the trick.
preg_replace("/.-url<\/a>./", "", $string)
or
preg_replace("/-url<\/a>/", "", $string)
One of them should do it or some thing close to that.
Also do abit of research on php.net. http://us3.php.net/manual/en/book.pcre.php has alot of info. Particularly the information under the "PCRE Patterns" and its sub categories.
As well I found a few very good sites that explain regex by searching google. Wish I could find the one I had up a few weeks ago that one got me going with the variation of what i just gave you above.