Ridding brick walkway of weeds without hurting moss

I have a brick walkway that is beginning to get a good crop of beautiful moss. However, there are weed also coming up. It is quite an extensive walkway & takes a lot of time to hand weed; inaddition it would need to be taken care of ea day. Can anyone suggest a natural spray or way to kill the grass/weed but not harm the moss. Vinegar is not an option as it kills the moss. Thank you for your comments
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