Rewrite Rules makes me crazy

[QuAzI]

I am trying to configure rule to replace links from https://animevost.org/rss.xml because it always redirects to random mirror like https://v11.vost.pw and after some time I see a lot of copes for same links but with different mirrors. So I tried Content Rewrite Rules and URL Rewrite Rules with next variants

=> replace(guid, '^https?://v[0-9]+\.vost\.pw', 'https://animevost.org')
=> replace(entry_url, 'https?://v\d+\.vost\.pw', 'https://animevost.org')
=> replace(content, 'https?://v\d+\.vost\.pw', 'https://animevost.org')
rewrite(guid, '^https?://v[0-9]+\.vost\.pw', 'https://animevost.org')

and nothing works. And I have no idea how to replace <guid> AND <link> - how to make multiple replaces in one line rule.
Examples on https://miniflux.app/docs/rules.html#rewriteurl-rules are irrelevant.
Moreover, even ChatGPT and Goolge Search AI are lie on these rules. Chat GPT propose Settings → Rewrite Rules → Add rule while no 'Add rule' available at all.

https://miniflux.app/docs/rules.html says

Miniflux includes a set of predefined rules for some websites, but you can define your own rules.

Predefined Rules page doesn't exist at all

And of-course there is no way to test rules except to ruin current feeds

[QuAzI]

Content Rewrite Rules started to work with rule

rewrite("^https?://v[0-9]+\.vost\.pw"|"https://animevost.org")

looks like at least some 'rule' validation required if it needs specific format

[QuAzI]

And looks like rewrite rule works only AFTER guid generation... or I have no idea which data used to identify the same link. Because if I try to catch https://anistar.org/rss.xml I see duplicates even if external links right