Honestly, the answer to that question depends on your constraints:

• How soon do you need this data?
• Is this a one-off, or will you need to utilize this more than this one time? (As someone's signature here said, "Makeshifts last longest.")
• How complex is your actual data? (Is it just this, or was this a SSCCE?)
• How comfortable do you feel working with a new-to-you module?

A regex is probably the quick-and-dirty way, but is also the most likely to break if the data changes. There are several Tutorials here of modules designed to work with HTML (and several others designed to work with XML, but may also be of use).

Given the time, were it me I would consider looking at those various Tutorials and experimenting with the modules shown there, but as I said, it depends on your criteria.

Hope that helps.