You can construct this kind of hostname pattern with the dictionary constructor:

new URLPattern({ hostname: '[\\:\\:1]' });

You can also get the constructor string to work if you wrap the hostname in a grouping. Either of these work:

new URLPattern("http://{[\\:\\:1]}/");
new URLPattern("http://(\\[::1\\])/");

As you can see, though, ipv6 syntax is going to need heavy escaping since it uses : which is a pattern special char and [] which are regexp special chars.

As discussed in the non-normative note under constructor string parsing the string constructor is meant as a convenience for common URLs, but is not expected to cover every case. If developers run into a situation where the constructor string does not work for their kind of URL they can fall back to the dictionary constructor.

In this case I think if we get lots of developer feedback that ipv6 is needed in the constructor string we could add it later since the current behavior throws. I'm a bit hesitant to add this complexity without that feedback, though.

Weird constructor results (for IPv6, non-ports) #110

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