Disclaimer: I am the project manager of that library. Looking at the patterns included in the other answers there are a number of good patterns that can be improved by referencing groups and utilizing lookaheads. Note: PHP has a built in filter for this which would be a better solution than this pattern. I generated the following using python and works with the re module. The look-ahead assertions ensure that the correct number of dots or colons appear in the address.
It does not support IPv4 in IPv6 notation. It is difficult to find a regular expression which works for all IPv6 cases. They are usually hard to maintain, not easily readable and may cause performance problems. Note : If you do not want to use IPAddress class in. NET, you can also replace it with my method. InetAddressUtils has all the patterns defined.
I ended-up using their pattern directly, and am pasting it here for reference:. I know this doesn't answer the original question specifically a regex solution , but I post this in the hope it may help someone else in the future.
Here's what I came up with, using a bit of lookahead and named groups. This is of course just IPv6, but it shouldn't interfere with additional patterns if you want to add IPv You can use the ipextract shell tools I made for this purpose. They are based on regexp and grep. Just matching local ones from an origin with square brackets included.
I know it's not as comprehensive but in javascript the other ones had difficult to trace issues primarily that of not working, so this seems to get me what I needed for now. As stated above, another way to get an IPv6 textual representation validating parser is to use programming. Try this small one-liner. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Regular expression that matches valid IPv6 addresses Ask Question. Asked 13 years, 2 months ago. Active 1 year, 11 months ago.
Viewed k times. Stefan Lasiewski Check out intermapper. I have found this to be the cleanest solution so far: stackoverflow. Active Oldest Votes. It should match: IPv6 addresses zero compressed IPv6 addresses section 2. Community Bot 1 1 1 silver badge. David M. Syzdek David M. Syzdek You IPv4 regex does not match IPs like IPv4 segments should not include leading zeros. 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.
Each block of hexdigits contains of 1 to 4 hex-digits not more than 4 hex-digits. Do i have forgotten some criteria? 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.
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