is too long ($x38 and $x40 represent 38 and 40 copies of [0-9a-f]) for
grep to handle. In order to still be able to match this, use the sed
invocation to replace what we're looking for with a token.
Improved-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>