Forums Scripts & Popups [Twitch]ignore text

there needed to be a $ after ON, and the dots and slashes needed backslashes to be used in it, so the url should look like so:
www\.twitch\.tv\/
(?!x3pos) there should not be any x3pos after the url
.* then any character
\/? followed by a optional slash

I hope that's it ^^;; Took me long enough