Need a tool to minimize HTML before storing in memecache

We do a lot with caching and storing in memecached as well as local copies so as to not hit the cache pool over the network and we have found some great tools to minimize our javascript and our css, and now we'd like to compress our HTML in these cache slabs. Anyone know of a good tool or even regex magic that I can call from PHP to compress/minimize the giant string web page before I store it in the cache? It's not quite as simple as stripping white space b/c obviously there are spaces between attributes in tags that need to be preserved, but also in the words/text on the page. I could strip out newlines I suppose, but then do I run into any issues in other ways? In any event, it seems like someone would have solved this by now before I go re-inventing the wheel. d.