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Regular Expression Details

Title Test Find IPv6 address
Expression
^([0-9a-fA-F]{4}|0)(\:([0-9a-fA-F]{4}|0)){7}$
Description
IPv6 address (128 bit). Matches hexadecimal patterns and single 0 in the address.
Matches
3e4f:123f:c12a:5566:888e:9975:aaff:2344 | 3e4f:123f:c12a:0:0:0:0:2344 | 0000:0000:0000:0000:0000:000
Non-Matches
3e4f:123f:c12a:5566:888e:9975:aafg:2344 | 3e4f:123f:c12a:0:0:0:1:2344 | 0000:0000:0000:0000:0000:000
Author Rating: Not yet rated. Dean Dal Bozzo
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Existing User Comments

Title: Many other regular expressions for Perl, Java, Ruby, Javascript
Name: Rich Brown
Date: 2/25/2010 11:10:49 PM
Comment:
We've found a number of other RE's that do the trick. Check out http://forums.dartware.com/viewtopic.php?t=452 There's a perl script there that has over 200 test cases as well.


Title: Many other regular expressions for Perl, Java, Ruby, Javascript
Name: Rich Brown
Date: 2/25/2010 11:09:55 PM
Comment:
We've found a number of other RE's that do the trick. Check out http://forums.dartware.com/viewtopic.php?t=452 There's a perl script there that has over 200 test cases as well.


Title: Incomplete
Name: Schwern
Date: 11/27/2009 8:00:43 PM
Comment:
This regex is incomplete. It misses valid IPv6 addresses such as ::ffff:c000:280 fe80:: and 2001:db8:a::123


Title: Not working for all IP addresses
Name: john
Date: 10/22/2008 5:31:42 AM
Comment:
if :: are used it wont work


Title: Not working with Java's Pattern class
Name: Jeybas
Date: 11/14/2007 12:08:43 PM
Comment:
Do any of these regular expressions work with Java's Pattern class. I ca'nt seem to get any working.


Title: A couple of improvements
Name: Andrew McMillan
Date: 4/17/2007 9:49:01 PM
Comment:
As the previous commenter points out, each of the quads may be shorter than 4 characters, and the missing digits are assumed to be zero. So a wider validation would be: ^[0-9a-fA-F]{1,4}(\:[0-9a-fA-F]{1,4}){7}$ Of course this still does not address issues of the possible shortening of IPv6 addresses where a long repeat of '0:' may be replaced with '::' ... For my own case I have implemented a "canonicalise" function which converts the '::' back into a suitable number of '0:' before validating against the above regex. Here is some (very crude, bad) perl to canonicalise them: sub canonicalise_ipv6_address { my $v6_in = shift; return $v6_in if ( $v6_in !~ /\:\:/ ); my $colons = $v6_in; $colons =~ s/[^:]//g; my $replace = ':'; for (my $i=length($colons); $i < 8; $i++ ) { $replace .= '0:'; } my $replaced = $v6_in; $replaced =~ s/\:\:/$replace/; $replaced =~ s/^\:/0\:/; $replaced =~ s/\:$/\:0/; return $replaced; } That's laborious, I'm sure. No doubt a perl guru could write it all in one magic regex. If you are such a person then feel free to do so in a comment below :-) Thanks, Andrew McMillan.


Title: not working for all
Name: Muhittin
Date: 10/4/2005 7:05:59 AM
Comment:
It doesn't match: 3e4f:23f:c12a:5566:888e:9975:aaff:2344 Note the second word, zero padding is OK to be removed.


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