How to grep (search) committed code in the Git history

Question

I have deleted a file or some code in a file sometime in the past. Can I grep in the content (not in the commit messages)?

A very poor solution is to grep the log:

Answer 1

Adding more to the answers already present. If you know the file in which you might have made do this:

git log --follow -p -S 'search-string' 

--follow: lists the history of a file