When trying to link to a twitch.tv help webpage, the forum will automatically add tags and try to embed a twitch.tv stream. Make the regex should be refined? Not sure how you guys tackle it but take the below. Both are the same link, I just added a space between :// and the url in the first instance so the forum wouldn't butcher it.
For instance take
https:// help.twitch.tv/customer/portal/articles/2420572
For instance take
https:// help.twitch.tv/customer/portal/articles/2420572