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

I took Jeet's answer and adapted it to Windows (thanks to this answer):

FOR /F %x IN ('"git rev-list --all"') DO @git grep  %x > out.txt

Note that for me, for some reason, the actual commit that deleted this regex did not appear in the output of the command, but rather one commit prior to it.