It appears you should attempt to write your own. With all the fine tools today to fetch a page and strip the text you could script this in under a hour if your spec is as you noted.

Then you can run this script as often as you feel the need.

The tools are:
1. Text editor.
2. Small apps like wget to scrap the page. http://en.wikipedia.org/wiki/Wget
3. Text processing apps that have been around for decades to find and product the result.
Bob