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What is the right regular expression or xpath query to do the following

Project:Feed Scraper
Version:6.x-1.x-dev
Component:Code
Category:support request
Priority:normal
Assigned:Unassigned
Status:active

Issue Summary

Hi,
I use feedapi to get rss feeds from another drupal site.
The url of those is:

www.otherdrupalsite.com/feeds/blabla.

With feedapi_scraper I will try to get the following result as output:
www.otherdrupalsite.com/blabla.

So I want to remove /feeds out of the url.
Is this doable please? If so can somebody tell me the right regular expression, or xpath query.

Thanks a lot in advance, trying this already long time to get dune!
Greetings, Martijn