"^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(%.+)?\s*$"

[–] YIj54yALOJxEsY20eU@lemm.ee 106 points 11 months ago

Lord have mercy

[–] dannym@lemmy.escapebigtech.info 83 points 11 months ago* (last edited 11 months ago) (1 children)

Please don't. Use regex to find something that looks like an IP then build a real parser. This is madness, its's extremely hard to read and a mistake is almost impossible to spot. Not to mention that it's slow.

Just parse [0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3} using regex (for v4) and then have some code check that all the octets are valid (and store the IP as a u32).

[–] Emma_Gold_Man@lemmy.dbzer0.com 11 points 11 months ago (8 children)

And dupe check. 0.0.0.0 and 000.000.000.000 may both be valid, but they resolve the same

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[–] MsPenguinette@lemmy.world 51 points 11 months ago (5 children)

IPv6 was a mistake. We should have just added an addition octet

[–] Centillionaire@kbin.social 75 points 11 months ago (5 children)

That would allow for like, 2 trillion devices? Feels like a bandaid, my dude. Next you’re gonna suggest a giant ice cube in the ocean once a year to stop global warming.

[–] stoy@lemmy.zip 13 points 11 months ago (1 children)

So add two more octets:

Moat companies will still just use something like 10.0.13.37.0.1

[–] 0xD@infosec.pub 11 points 11 months ago (5 children)

IPv6 is not made with internal networks in mind lol

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[–] shasta@lemm.ee 9 points 11 months ago (2 children)

And nuke the hurricanes

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[–] Nalivai@discuss.tchncs.de 17 points 11 months ago (2 children)

Oh yeah, great, let's change the fundamental protocol on which all the networks in the world are based. Now two third of the devices in the world crashed because you tried to ping 192.168.0.0.1

[–] tilcica@lemm.ee 12 points 11 months ago

that WOULD be quite funny for the first second or 2....

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[–] rob64@startrek.website 35 points 11 months ago (1 children)

https://imgs.xkcd.com/comics/perl_problems.png

[–] Patches@sh.itjust.works 19 points 11 months ago* (last edited 11 months ago) (1 children)

Made that joke in an interview once.

They didn't think it was funny. They truly thought Regex was the solution to, but never the cause of, all problems.

They wanted to make a Regex to verify every single address in the world. Dodged a bullet

[–] rob64@startrek.website 9 points 11 months ago* (last edited 11 months ago) (2 children)

Holy hell yeah you did. How would you go about doing that in a single expression? A bunch of back references to figure out the country? What if that's not included? Oy.

[–] Patches@sh.itjust.works 15 points 11 months ago* (last edited 11 months ago) (2 children)

You wouldn't. It's not possible. Which is what I told them.

And why would you want to? Legally if you change the given address, and it fails to get delivered - that is on you. Not them.

Some countries have addresses that are literally 'Last house on the left by the Big Tree. Bumban(Neighborhood). NN (Country)'. Any US Centric validation would fail this but I assure you - mail gets delivered just fine.

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[–] BeigeAgenda@lemmy.ca 31 points 11 months ago

It's always a treat to debug a regex of that size.

[–] SchizoDenji@lemm.ee 29 points 11 months ago

I knew there would be someone with the regex.

[–] takeda@lemmy.world 18 points 11 months ago* (last edited 11 months ago)

You're more of a perl programmer than network engineer :P

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[–] Static_Rocket@lemmy.world 175 points 11 months ago (3 children)

0.0.0.0/0 0::0/0

You didn't specify it couldn't be in CIDR block notation...

[–] Redjard@lemmy.dbzer0.com 26 points 11 months ago

::/0

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[–] Mr_Dr_Oink@lemmy.world 90 points 11 months ago (4 children)

0.0.0.0 /0 ::/0

SUCK MY DICK, GRU!

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[–] agilob@programming.dev 81 points 11 months ago* (last edited 11 months ago) (1 children)

:00 - :ff

Edit: Just learnt this can be also noted as:

:: - ::f

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[–] michaeljo94@discuss.tchncs.de 67 points 11 months ago (2 children)

0.0.0.0/0

[–] Emma_Gold_Man@lemmy.dbzer0.com 21 points 11 months ago (1 children)

Better hope the goon hasn't heard of IPv6 either, or you're toast

[–] oatscoop@midwest.social 22 points 11 months ago

::/0

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[–] Kolanaki@yiffit.net 65 points 11 months ago* (last edited 11 months ago)

This is gonna take a while...

0.0.0.0

0.0.0.1

0.0.0.2

0.0.0.3

...

[–] knobbysideup@lemm.ee 41 points 11 months ago* (last edited 11 months ago) (2 children)

0.0.0.0/0

::/0

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[–] rez_doggie@lemmy.world 40 points 11 months ago

0.0.0.0/0

[–] doctorcrimson@lemmy.today 26 points 11 months ago* (last edited 11 months ago) (2 children)

ipv4 [0,255].[0,255].[0,255].[0,255]

ipv6 [0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]

[–] Hobo@lemmy.world 14 points 11 months ago* (last edited 11 months ago) (1 children)

This excludes all the ipv4 ips that have a 0 in the 2nd, 3rd, and 4th octets. Sorry but we're going to have to revoke your Network Engineering credentials.

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[–] tabularasa@lemmy.world 10 points 11 months ago (1 children)

Not to nitpick, but an IPv6 address is represented as eight groups of four hexadecimal digits separated by :. Like 2001:0db8:3333:4444:5555:6666:7777:8888.

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[–] dan@upvote.au 26 points 11 months ago* (last edited 11 months ago) (3 children)

This reminds me of something I saw online maybe 20 years ago now. Someone created a torrent with a name like "every IP address ever (hacking tool)" and uploaded it to Suprnova, which ended up having thousands of people seeding it. It was just a text file with every IPv4 from 0.0.0.0 to 255.255.255.255 😂

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[–] Seasm0ke@lemmy.world 22 points 11 months ago

[–] shootwhatsmyname@lemm.ee 21 points 11 months ago

one of them has a 7 I’m pretty sure

[–] GammaGames@beehaw.org 21 points 11 months ago

0.0.0.0/0

[–] Napain@lemmy.ml 18 points 11 months ago (1 children)

/32

[–] Z3k3@lemmy.world 22 points 11 months ago

That's only 1 ip (single host)

[–] spudwart@spudwart.com 17 points 11 months ago

I mean if I name them do I have to own the domain or…

[–] quinkin@lemmy.world 16 points 11 months ago (1 children)

1 and 0. Some assembly required.

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[–] 018118055@sopuli.xyz 15 points 11 months ago

0/0

[–] MonkderZweite@feddit.ch 15 points 11 months ago* (last edited 11 months ago)

My PC's is now Bob, My router's Billy...

[–] xav@programming.dev 11 points 11 months ago (4 children)

I'll start.

0.0.0.1: Sophie

Your turn.

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[–] vox@sopuli.xyz 11 points 11 months ago

ipv6

[–] LemmysMum@lemmy.world 9 points 11 months ago (1 children)

127.0.0.1

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[–] HiddenLayer5@lemmy.ml 9 points 11 months ago (1 children)

Name every protocol

[–] QuazarOmega@lemy.lol 10 points 11 months ago (1 children)

[–] stringere@reddthat.com 13 points 11 months ago (1 children)

UDP

I'd love to tell you a joke about UDP but I'll never know if you get it.

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[–] DaveedMee@beehaw.org 7 points 11 months ago

127.0.0.1

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