Supporting "-v" option for git-log

I want to use git log to show all commits that do not match a given pattern. I know I can use the following to show all commits that do match a pattern, similar to the "grep -v" command line option:

    git log -v --grep=<pattern> # results all commits that do NOT match pattern

Is there a way invert the sense of matching?

If not, is it OK to submit a patch? Anything to consider for this patch?

[*] x-post from here http://stackoverflow.com/questions/5602204/how-to-invert-git-log-grep-pattern-or-how-to-show-git-logs-that-dont-match