I *think* that I'm SOL for an easy way then - I lost all my photos from my home machine through a combination of me being stupid (trying to move iPhoto library to be on an external drive) and the external drive failing.
Luckily, most of my photos were on my Smugmug gallery, so I got a recovery disc from them, but all the Nikon file names (DSCNxxx.jpg) were prefixed by what I assume are some Smugmug numbers, so DSCN0000001.jpg is now 123456789_DSCN0000001.jpg, for example.
I imported them back into iPhoto, but now that screws up my sorting because the prefix numbers aren't in the same order as the DSCN file names, so stuff is all over the place.
All I want to do is remove everything before the DSCN bit, where there is something before the DSCN bit, if you get my drift. Any ideas?