App to notify me of keywords on facebook groups posts

Hi,. Im wondering if there is a way i can have an app or something that looks for keywords on facebook groups im part of, then when found sends me the details. This can be a chrome plugin or i also have an Raspberry pi server running 24hrs. I have a garden maintenance business that i want to have this app constantly looking at facebook for people posting in groups words like " need mowing" " gardener" Then it needs to either take a copy of the post and email me it or somehow notify me, It would be even better if possible if the app could post my business facbook page on the comments, then auto send the person a private message too?