Originally Posted by dwanthny
I know nothing about regex and I am glad you are attempting this primer for those of us without any idea what a regex is.
As I see it in your example above, a brief review makes it look like you are saying to start your regex with <p class="calibre4"> and end with </p> without being much more specific this will include many other paragraphs of text as well.
Well, that depends on what the regexp really is like- if you read carefully, you'll notice I've only mentioned that you should remove corresponding tags, I haven't really given a regexp. Given the example text I've used, I don't see how cutting out the part between the opening and closing <p>-tags removes any book text.