How to get the owner_id and post_id of VKontakte?

Question

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How to get the owner_id and post_id of VKontakte from another community?
And what is this?

Answer 1

On the example of the link - vk.com/wall-29246653_184828

owner_id = -29246653
post_id = 184828

owner_id starts with a minus if the post is from the community, without a minus - from the user.