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Regular Expression Details

Title Test Find Pattern Title
Expression
^((([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})|(([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(([0-9A-Fa-f]{1,4}:){0,5}:((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(::([0-9A-Fa-f]{1,4}:){0,5}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))$
Description
Matches full and compressed IPv6 addresses as defined in RFC 2373 (http://www.faqs.org/rfcs/rfc2373.html). No useful captures. Various implementations require different terminators. (i.e. ^-$ or \b-\b)
Matches
FEDC:BA98:7654:3210:FEDC:BA98:7654:3210 | 1080::8:800:200C:417A | ::FFFF:129.144.52.38
Non-Matches
FEDC::7654:3210::BA98:7654:3210 | FEDC:BA98:7654:3210 | ::
Author Rating: The rating for this expression. Jeff Johnston
Source
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Existing User Comments

Title: @Chetan Hanumantha
Name: Aeron
Date: 3/7/2012 9:25:44 AM
Comment:
Posted a bit late but your corrected regex doesn't match: :: and does match: 1111:2222:3333:4444:5555:6666:00.00.00.00 :1.2.3.4 :6666:1.2.3.4 :5555:6666:1.2.3.4 :4444:5555:6666:1.2.3.4


Title: Working regular expression. This regular expression fixes problems mentioned below.
Name: Chetan Hanumantha
Date: 3/12/2009 8:06:05 AM
Comment:
^( (([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})| (([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})| (([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})| (([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})| (([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})| ( ([0-9A-Fa-f]{1,4}:){6} ((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3} (\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b) )| ( ([0-9A-Fa-f]{1,4}:){1,5}:((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| (([0-9A-Fa-f]{1,4}:){1}:([0-9A-Fa-f]{1,4}:){0,4}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| (([0-9A-Fa-f]{1,4}:){0,2}:([0-9A-Fa-f]{1,4}:){0,3}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| (([0-9A-Fa-f]{1,4}:){0,3}:([0-9A-Fa-f]{1,4}:){0,2}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| (([0-9A-Fa-f]{1,4}:){0,4}:([0-9A-Fa-f]{1,4}:){1}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| (::([0-9A-Fa-f]{1,4}:){0,5}((\b((25[0-5])|(1\d{2})|(2[0-4]\d) |(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))| ([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})| (::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})| (([0-9A-Fa-f]{1,4}:){1,7}:) )$


Title: reg ex error
Name: Chetan
Date: 3/12/2009 4:53:51 AM
Comment:
This regular expression says :1.2.3.4 as valid which is wrong


Title: reg ex error
Name: Chetan
Date: 3/12/2009 4:52:29 AM
Comment:
This regular expression says :1.2.3.4 as valid which is wrong


Title: reg ex error
Name: anonymous
Date: 9/13/2006 9:56:01 AM
Comment:
error in A::A:1.1.1.1 this should be valid ipv6 address


Title: Small addition to add CIDR notation
Name: Nicholas Telford
Date: 6/13/2005 11:27:45 AM
Comment:
Great regex, truly good work. I've found no flaws in this regex so far, it seems fully compliant with the RFC. Small note, if anyone wishes to use this regex to optionally validate an IPv6 address in CIDR notation as well, simply add the following to the end of the regex (before the trailing $ of course): (/(1[0-1][0-9]|12[0-8]|[2-9][0-9]|1[6-9]))?


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