Probably documents from HP’s atrocious support site

This is an example of the old adage that “When you use a regex to solve a problem, you end up with two problems.”

Looks like an URL matcher of some sorts, that isn't limited to HTTP. Kudos for handling parentheses as valid URL characters.

That's John Gruber’s regex pattern for matching URL's (⌐■_■).

No

As visualized by Regex Vis [1]

As visualized by Regexper [2]

The regex fucks with the markdown, so I had to put them in code tags:

[1] https://regex-vis.com/?r=%5Cb%28%28%3F%3A%28%3F%3A%5Ba-z%5D%5B%5Cw-%5D%2B%3A%29%3F%28%3F%3A%2F%7B1%2C3%7D%7C%5Ba-z0-9%25%5D%29%7Cwww%5Cd%7B0%2C3%7D%5B.%5D%7C%5Ba-z0-9.%5C-%5D%2B%5B.%5D%5Ba-z%5D%7B2%2C4%7D%2F%29%28%3F%3A%5B%5E%5Cs%28%29%3C%3E%5D%2B%7C%5C%28%28%5B%5E%5Cs%28%29%3C%3E%5D%2B%7C%28%5C%28%5B%5E%5Cs%28%29%3C%3E%5D%2B%5C%29%29%29*%5C%29%29%2B%28%3F%3A%5C%28%28%5B%5E%5Cs%28%29%3C%3E%5D%2B%7C%28%5C%28%5B%5E%5Cs%28%29%3C%3E%5D%2B%5C%29%29%29*%5C%29%7C%5B%5E%5Cs%60%21%28%29%5C%5B%5C%5D%7B%7D%3B%3A%27%22.%2C%3C%3E%3F%C2%AB%C2%BB%E2%80%9C%E2%80%9D%E2%80%98%E2%80%99%5D%29%29

[2] https://regexper.com/#\b((?:(?:[a-z][\w-]%20:)?(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()%3C%3E]+|\(([^\s()%3C%3E]+|(\([^\s()%3C%3E]+\)))*\))+(?:\(([^\s()%3C%3E]+|(\([^\s()%3C%3E]+\)))*\)|[^\s%60!()\[\]{};:'%22.,%3C%3E?%C2%AB%C2%BB%E2%80%9C%E2%80%9D%E2%80%98%E2%80%99]))

At first glance IP address or URL, embedded in HTML, whatever it is, it's a doozy. I wonder what the performance of it is like.

Whatever this is supposed to match, I bet the bycatch is bigger than tuna fishing.

:(

Hold on, let me draw up the NFA