| Title |
Test
Find
IPv6 (and IPv4) Address match with optional Port Number
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| Expression |
(^|\s|(\[))(::)?([a-f\d]{1,4}::?){0,7}(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?=(?(2)\]|($|\s|(?(3)($|\s)|(?(4)($|\s)|:\d)))))|((?(3)[a-f\d]{1,4})|(?(4)[a-f\d]{1,4}))(?=(?(2)\]|($|\s))))(?(2)\])(:\d{1,5})? |
| Description |
Too complex for a short explanation. It doesn't check for valid IP ranges and it also doesn't obey the rule, that a double colon in IPv6 only can exist once in the address notation. The optional port match at the end can be omitted. The RegEx has been constructed the way, that if an explicit identification fails, the complete match fails. For example someone write "My adress:2001::1234" the match will fail 'cos of the leading colon, even though it's an valid IPv6 address. A "My adress: 2001::1234" or "My adress:[2001::1234]" will work. Beware, that the RegEx is build for case-insensitive usage and no whitespaces are allowed inside the address.
If you want to embed it into a larger RegEx, take into account to adjust the conditional matches wich refers to (?(2) -> (\[) inside (^|\s|(\[)) and (?(3) -> (::)? and (?(4) -> ([a-f\d]{1,4}::?) Works not perfectly, but I'm currently out of time. |
| Matches |
::ffff:21:7.8.9.221 | 2001:0db8:85a3:08d3:1319:8a2e:0370:7344 | ::8a2e:0:0370:7344 | 2001:0db8:85a3:08d3:1319:8a2e:100.22.44.55 | 2001:0db8::8a2e:100.22.44.55 | ::100.22.44.55 | 100.22.44.55 | 100.22.44.55:80 | [::100.22.44.55]:8080 | [20ff::100.22.44.55]:8080 |
| Non-Matches |
20ff::100.22.44.55:8080 | ::8a2e:0:0370:7344.4 | 2001:0db8::8a2e:100.22.44.55:8080 | 2001:idb8::111:7.8.9.111 | 2001::100.a2.44.55 | :2001::100.22.44.55 | ffff:: (has to be fixed, 'cos a valid address) |
| Author |
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Gerry
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