Selective auto-posting from various sources, how to implement?

Question

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Hello, please tell me the easiest way to organize SELECTIVE auto-posting from social networks. Ideally: monitoring posts / articles / news from any resource ----> checking their content according to certain parameters ----> posting on another resource, be it a wall, chat, etc., part of the content.
For example: there are 5 groups in Vkontakte. I want to follow their news. If a post contains a certain tag or phrase, I want to get the image (or first paragraph) from that post.

Answer 1

Well, there are many options.
For example, I use the API and automatic filtering with publication in vk and instagram. According to certain algorithms, I select what I need.