The extra parens are needed in order for the anchors to do what you want. The OP regex was really saying: "if the string STARTS with an IPv6 string, OR if it ENDS with something that contains one or more IP address characters and/or percent signs".

BTW, you might want to include underscore as a possible sql wildcard character, because it is (and can be very useful in certain cases).

In reply to Re^3: Roughly matching an ipv6 address with sql wildcard by graff
in thread Roughly matching an ipv6 address with sql wildcard by neilwatson

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