grep - What is the best way to undelete some photos on Linux? Is there any way to use foremost to only recover files that only contain some text?

I accidentaly deleted some digital photos I had recently taken, and I wanted to undelete them. I found out about Foremost, and it allows me to recover jpg files, but will fo that with all of the images I ever deleted.

I know all the files I want will contain the string "COOLPIX L20" in some part of the file. I can grep the hard drive and will find something, but I don't know how to "separate" that into image files.

In short, is there any way for foremost to only recover files with some string, or some better ay to do it?