Whitelist per feed

[stefanblaginov]

Checklist

• I have used the search function for OPEN issues to see if someone else has already submitted the same feature request.
• I have also used the search function for CLOSED issues to see if the feature was already implemented and is just waiting to be released, or if the feature was rejected.
• I will describe the problem with as much detail as possible.
• This request contains only one single feature, not a list of multiple (related) features.

App version

2.9.1

Where did you get the app from

F-Droid

Feature or improvement you want

A required list i.e. a list of strings that are required to be present in a feed entry, that is defined per feed (the inverse of #372).

Why should this be added?

I would like to an unfiltered feed e.g. a feed about a particular open source project.
I would like to also have another feed of my local town news website, but only showing news containing either the keyword concert or concerts or event or events. This is because althouth this small town gazette might be the only place listing those events that I'm interested in, they also like covering world news, which I might get from a different feed (duplicate news).

In essence this would deal with feeds that are (subjectively) very spammy, but may contain a nugget of gold every once in while.

Screenshots / Drawings / Technical details

Or-ing the strings would be sufficient.

[spacecowboy]

Updated title