Yes, of course. But based on the description, I think I would recommend to 'Free text search' enable the database and start looking through the database that way, at least first. I was not 100% certain of what you want to achieve, but to find email addresses inside all fields the use of free text search is normally very effective. So if it is only for finding that is an easier approach.
If you want to MODIFY something, then I would have used an agent. Also agents can use the facility of free text search to select wanted documents, and then work on a document collection.
This answer became a bit 'generic', mostly because it was a little hard to see what result(s) to be achieved.
Brgds,
TrooDOS