Regex to parse html for sentences?

I know that HTML:Parser is a thing and from reading around, I've realized that trying to parse html with regex is usually a suboptimal way of doing things, but for a Perl class I'm currently trying to use regular expressions (hopefully just a single match) to identify and store the sentences from a saved html doc. Eventually I want to be able to calculate the number of sentences, words/sentence and hopefully average length of words on the page. I know that HTML:Parser is a thing and from rea