search by filename only (not entire path)

[suan]

Say in my current directory there's:

somefolder/lala/somefile.txt
somefoler/lala.txt

It would be nice to have a flag that searches based on filename only, such that when I do
ack -g -<new flag> lala

I'd only get back
somefolder/lala.txt

[hoelzro]

Migrated to the ack2 queue.