userscript / greasemonkey / violentmonkey script to hide all posts from a subreddit by name (not case sensitive) or by regex

subreddit_blocker.js

// ==UserScript==
// @name           subreddit_blocker
// @description    Hides all posts from subreddits by name (not case sensitive) or by regex.
// @author         khlam
// @match          http://*.reddit.com/*
// @match          https://*.reddit.com/*
// @version        0.0
// ==/UserScript==

const regex = [] // your regex block here, comma seperated.
//const regex = [/news/, /memes/] // <--- will block /r/worldnews, /r/news, /r/meme, and /r/memes

const blacklisted_subs = [ // specific subreddits to never show posts from, comma separated
    "worldnews" // <--- will block /r/worldnews, not case sensitive
]

let blacklisted_subs_lower = blacklisted_subs.map(e => { return e.toLowerCase() }) // all blacklisted subreddits to lowercase

let all_threads = document.querySelectorAll("[data-subreddit]")

all_threads.forEach(thread => {
    let this_sub = thread.getAttribute('data-subreddit').toLowerCase() // post's subreddit to lowercase

    // if subreddit is in blacklist or if subreddit matches regex then hide it
    if ((blacklisted_subs_lower.includes(this_sub) === true) || regex.some(function(r) { return r.test(this_sub)}) === true) { 
        console.log("HIDING", thread)
        //thread.innerHTML = `Content from ${this_sub} hidden.`
        thread.style.display = "none"
    }
})