How to do search and replace with a lookup

[Angus Comber <anguscomber@gmail.com>]

I have log file output like this:

Received device state message: pen state = 11 - uig state 10

where pen state and uig state are enums.

I want to do a search and replace where if for example pen state 11 enum is diagnostics and uig state 10 enum is starting, then I want the line to be updated to:

Received device state message: pen state = diagnostics - uig state starting

What is the easiest way to do this?

I can do search and replace using c-m-% and change for each permutation of number to string but that would be fairly labour intensive if enums were fairly long.  Can I combine that with a lookup somehow?  What is best way to do it?