[BUG] t7004 (master) busted on Leopard

Commit 4d8b1dc850 added a couple of tests to t7004, and my testing reveals that this one has been broken on Leopard since then:

* FAIL 83: message in editor has initial comment
GIT_EDITOR=cat git tag -a initial-comment > actual || true &&
test $(sed -n "/^\(#\|\$\)/p" actual | wc -l) -gt 0

(Not sure whether this affects other platforms, or versions of Mac OS X prior to Leopard, as I only have one machine here.)

The problem is the version of sed that ships with Leopard fails to match the initial comment with this syntax:

sed -n "/^\(#\|\$\)/p" actual

An alternative that works is:

sed -n "/^[#\$]/p" actual

Can someone with knowledge of sed compatibility across multiple platforms suggest an alternative which will work on a wider range of systems?

Cheers, Wincent