Have you tried google desktop? Once you load the page, you can fire up google desktop, and it would be able to search through that page as well, since it is in the cache.
My tools of choice: wget and grep.
wget to fetch the web page
grep to do the searches
Your regular expressions (what you tell grep to look for) should be simple enough, but any easy way to write regular expressions is to use is Regex Coach (http://www.weitz.de/regex-coach/).