For the same reason the ipv6 address is enclosed in square brackets. Is that not the case?
There are a number of occurrences in log lines that are of the form {address}:{port}
This is fine for IPv4 addresses 127.0.0.1:123 which can be matched with @IPv4@:@NUMBER@
If the address is a complete IPv6 address with port 2607:f8f0:c10:fff:200:5efe:ce57:5330:123 the
same pattern can be used to match it @IPvAny@:@NUMBER@
If the IP address is a shortform IPv6 address such as ::ffff:127.0.0.1 and adding the port number
::ffff:127.0.0.1:123 this fails to be matched by @IPvAny@:@NUMBER@
Has anyone else seen bumped into this issue?
For anyone taking a stab at this, this page looks interesting
http://rosettacode.org/wiki/Parse_an_IP_Address
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