git log --grep missing entries?

Hi,

I ran into this the other day when I was looking at jgit's log history. I retested today with the latest master branch, and it does the same thing.

So... what am I doing wrong?

	git clone git://repo.or.cz/egit/spearce.git bsd
	git log |grep "^Author:" | sort | uniq

	# note the user: Thad Hughes <thadh@thad.corp.google.com>

	# nothing appears for these commands
	git log --grep="thadh@thad.corp.google.com"
	git log --grep="google.com"
	git log --grep="thadh"

	# this works
	git log --author="thadh@thad.corp.google.com"

	# this works
	git log | grep thadh@thad.corp.google.com

- Chris