I spent a decade parsing text-with-angle-brackets with regexes, and it sucks. It’s always tempting to try an html parser but if the code is written by a human (or worse, a mixture of human and machine, especially if the machine involves MS Word) it just doesn’t work.

I’d suggest rather than attempting to do big regexes that capture a bunch of stuff in one call, break it down to a bunch of smaller, more targeted calls - one call to capture the text of the whole record, another with 3 variants to get the title, another with 2 variants to pick up a tag line, etc.