Which ipv6 is valid

If a leading zero is present, the IPv4 segment should be interpreted in octal. It does however permit '00' which it should not. Did not work for me in the browser as I would expect. Validated even reg. Had much better results with regex here: nbviewer. Show 24 more comments. Even though validating ip-s could be done as Frank Krueger suggests, this solution is the one that actually answers the question though I haven't fully tested it yet as well as if you have many IP-s that you want syntactically test and maybe match for in a line of text, you can't use the IP validation technique.

Hi, I tested this RegExp and don't worked for me. It says D is an invalid flag and when I remove it it says "SyntaxError: invalid quantifier" — Diosney. My regex won't work without some of the advanced features of PCRE. This gives exception for me in C — sarat. Show 4 more comments.

It sounds like you may be using Python. Joe Hildebrand Joe Hildebrand 9, 2 2 gold badges 34 34 silver badges 46 46 bronze badges. You should specify the exception type in the except clause. Otherwise, except will catch everything and may mask unrelated errors. The type here should be socket. Re: other errors Clearly a list isn't an ipv6, but I'd probably want to have it carp that I was passing in the wrong type.

A couple of additional points that should be added: 1 socket. It might not be available on Win-platforms. Add a comment. Factor Mystic Factor Mystic Regular expression like this should be a "code smell" that perhaps regular expression are not the best suited solution here.

Although, I guess the op did ask for it This is a completely unnecessary travesty to REs. The program that generated it didn't understand what it was doing. A human would never do it this way. Don't be fooled by the apparent complexity - REs are indeed "black magic" to many people, but there's no reason to place them on another planet!

It is indeed a code smell; however after taking a look you'll see that each regex is fairly concise. The problem is that there are different patterns created by the 'compression' of ipv6 -- Colons beginning,middle, and end, on top of if you've used your double colon you can't use it again, on top of the total colons before and after the double have to add up. Perl 6 might be able to tackle this, but it is way beyond PCRE syntax.

PS -- I don't count the embedded ipv4 at the end, which is longer than the ipv6 section! Jeroen Vermeulen - MageHost 9 9 silver badges 19 19 bronze badges. Rohit Malgaonkar Rohit Malgaonkar 5 5 silver badges 5 5 bronze badges. I like the simplicity. Humor appreciated! Jon Cram Jon Cram Using two regular expressions, a liberal expression and an exceptions expression to trap invalid addresses allowed by the first, might be easier than one expression return ex1.

You're assuming that he is validating individual IPs when he is almost certainly searching for IPs in a large block of text. Remi Morin Remi Morin 2 2 gold badges 6 6 silver badges 11 11 bronze badges. This don't match "" — lsalamon.

Somewhere else someone notify me of a problem with my regex, compressed part "::" can only appear once. So "" would match with my regex but it's not a valid IPV6. A second regex may validate this case. The full recommendation was to use a stateful parser to validate. I agree that resulting code will be easier to read and maintain and someone probably already coded it in an open source somewhere.

Egor Brad Gilbert Brad Gilbert 33k 10 10 gold badges 76 76 silver badges bronze badges. Or Data::Validate::IP search. I successfully use this in iTerm2 smart selection rules to quad-click IPv6 addresses. JinnKo JinnKo 8 8 silver badges 13 13 bronze badges. You meant A-F , not A-Z! Also note that you are excluding dotted-quad notation.

Sean F Sean F 3, 14 14 silver badges 24 24 bronze badges. Following regex is for IPv6 only. Group 1 matches with the IP.

Jitendra Gosavi Jitendra Gosavi 53 4 4 bronze badges. I will use this one because I understand what it does and in my case, I can be sure that if I got something that resembles a valid ipv6, so it is a valid ipv6.

Kaymaz use some context in your regex. I thnik no. All of these criteria are easy to proof, so this list of criteria should answer your question. Yes, it can. It consist of hexadecimal digits, which are.

Shure, it was a typing error, i wanted to type a-f and A-F. If you encounter a technical issue on the site, please open a support case. Communities: Chinese Japanese Korean. All Rights Reserved. The Cisco Learning Network. Call JMeter Command How to call JMeter command in a Windows batch file?

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