Method to parse HTML document in Ruby?
There is no built-in HTML parser (yet), but some very good ones are available, in particular Nokogiri.
Meta-answer: For common needs like these, I'd recommend checking out the Ruby Toolbox site. You'll notice that Nokogiri is the top recommendation for HTML parsers
You should check out hpricot. It's exceedingly good. It's not 'core' ruby, but it's a commonly used gem.
You can also try Oga by Yorick Peterse.
It is an XML/HTML parser written in Ruby that does not require system libraries such as libxml. You can find it here. https://github.com/YorickPeterse/oga