Hi Charilaos,
First way (using a group to match the text we want to keep, and use $1 to refer to it in the substitution string): Search for: (\d{4}.)\s Replace by: $1\n
This worked perfectly (aside from the single exception that you pointed out:
Btw, you would probably want \s+ in those instead of just \s, to absorb more than one spaces, if that happens. Keep in mind, this method of yours will also break at the "Year 2000." line below. Not easy to avoid that though, hopefully it's only a few cases.
Greatly appreciated!