No, that'll collapse everything to a single line! To remove blank lines, in Regular Expression mode replace \r\n(\r\n)+ with \r\n That assumes that the blank lines don't have any whitespace. If they might, then replace \r\n(\s*\r\n)+ with \r\n
"Fairy tales do not tell children the dragons exist. Children already know that dragons exist. Fairy tales tell children the dragons can be killed." - G.K. Chesterton