I'm not sure I understand the question. Are you asking: "Because there is a space in the value of $ip_query, it should not match $regex, but the test shows that it does match. Why is that?"

If so, it's interesting that if I take (?: $RE{net}{IPv6} ) | out of the code, it behaves as expected -- that is, the value of $ip_query does not match $regex, when $regex is just (?: [0-9a-f:%]+)

Also interesting: when $regex is just (?: $RE{net}{IPv6} ) the string does not match, as expected -- that is, the test passes.

Looks like you need a set of parens that surrounds the conjunction alternation: 

my $regex = qr/\A
(
   (?: $RE{net}{IPv6} ) | # A full IPv6 address
   (?: [0-9a-f:%]+    )   # A portion of an IPv6 address with SQL % wi
+ldcards
)
\Z/imsx;

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In reply to Re: 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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