Earlier quoted context omitted.
> No filtering. Shameless(-ish) plug for my project, siftrss: https://siftrss.com/ You add a source feed, include/exclude items by keyword or regex match, and get a new filtered feed to subscribe to. Because it produces a normal RSS feed like any other, it works with all RSS readers. It's totally free. No ads, no account, no email capture, nothing but totally disposable RSS feed filters.
Nice! I may use this to add more feeds to my ruby news aggregator at http://rubyland.news , cool? Hmm, I wonder if there's a way to use it to turn a Medium feed into something useful. (By default, a medium feed is not, as it contains all comments by the author interspersed with actual stories/posts, with no obvious way for software to distinguish).
As for Medium feeds, it's all about whether or not you can find a pattern in the data to exploit. For instance, maybe links for comments contain "/c/" whereas links for posts contain "/p/" or something similar. There is, of course, no guarantee that there is anything to exploit or that what is exploitable won't change—that's the joy of dealing with third-parties! :)