Pastel

Alright nerds, who can guess what this RegEx matches?

https://sopuli.xyz/post/42387212

Mar 10 at 9:58pmWeb
Show threadpewpewMar 10
No
Show threadOnno (VK6FLAB)Mar 10
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.
Show threadDreamButtMar 10
At least 2
Show threadtowerfulMar 10
It works out as O(regex^n)
Show threadbleistift2Mar 10
Nothing. It’s invalid.
Show threadAatubeMar 10
check out Regulex! it doesn’t support mode modifiers but it does lack some features but i really like how its graphs look
Show threadulternoMar 12
Nice. Is there terminal/native running software with something similar?
Other than just running the HTML+JS/TS project in a container.
Show threadsudoMakeUserMar 10
Hold on, let me draw up the NFA
Show threadxombie21Mar 10
That’s John Gruber’s regex pattern for matching URL’s (⌐■_■).
Show threaderayerdinMar 13
truly a sunglasses moment indeed
Show threadOlgratin_MagmatoeMar 10
:(
Show threadbleistift2Mar 10
Whatever this is supposed to match, I bet the bycatch is bigger than tuna fishing.
Show threadneidu3Mar 10
Looks like an URL matcher of some sorts, that isn’t limited to HTTP
Show threadrefaloMar 10
URLs can have newlines too
Show threadhoshikarakitaridiaMar 11
!unlearn
Show threadVenatorMar 12

It seems most browsers basically ignore them:

lemire.me/…/you-can-use-newline-characters-in-url…

So probably not worth remembering anyway.

You can use newline characters in URLs

We locate web content using special addresses called URLs. We are all familiar with addresses like https://google.com. Sometimes, URLs can get long and they can become difficult to read. Thus, we might be tempted to format them like so in HTML using newline and tab characters, like so: <a href="https://lemire.me/blog/2026/02/21/ how-fast-do-browsers-correct-utf-16-strings/">my blog post</a> It will … Continue reading You can use newline characters in URLs

Daniel Lemire's blog
Show threadQuantenteilchenMar 11
Also no encoded basic auth or raw ip addresses (not that a useful website would likely use raw ipv4 or 6 since that causes huge CORS and sometimes even DNS issues…)
Show threadSphksMar 11
What. The. Fuck.
Show threadmarlowe221Mar 11
This is an example of the old adage that “When you use a regex to solve a problem, you end up with two problems.”
Show threadKamikaze RusherMar 11
Probably documents from HP’s atrocious support site
Show threadDarkSirrushMar 11
URLs in an HTML document that aren’t namespaces or otherwise enclosed?
Show threadNotMyOldRedditNameMar 11
Is it a rick roll?
Show threadtamiya_tt02Mar 11
Looks like the hacking mini game in Fallout 4.