Right now, when I have my cursor over one of the numerals in "L347" and hit ^G, JOE does nothing. I have to move my cursor over the 'L' before I hit ^G for JOE to start a search for "L347". This patch causes JOE to start a search when hitting ^G with the cursor over one of the numerals. It also causes JOE to start searches for plain numerals, without any alpha characters in them. I think that is desirable behavior, and preferable to doing nothing.
This patch is on top of patch 3459243.