C# - Best Approach to Parsing Webpage?

I've saved an entire webpage's html to a string, and now I want to grab the "href" values from the links, preferably with the ability to save them to different strings later. What's the best way to do this?

I've tried saving the string as an .xml doc and parsing it using an XPathDocument navigator, but (surprise surprise) it doesn't navigate a not-really-an-xml-document too well.

Are regular expressions the best way to achieve what I'm trying to accomplish?