i've tried other regexes that are supposed to be able to remove blank lines from a document, but none of them seem to work within BBEdit's find-and-replace.
What is a regex for stripping blank lines from a document that will work in bbedit?
I'm going to assume that there may be whitespace in the lines you wish to remove. This should do the trick:
^\s*?\r
(replace with nothing, make sure the "Grep" checkbox is ticked)