Trust signature domain

[John Lane]

>> I'm trying to experiment with trust signatures but I can't work out how
>> the 'domain' question is used ?
>>
the only thing I've been able to find is this regular expression

|<[^>]+ at example.net>$|

(http://linuxfr.org/users/gouttegd/journaux/de-la-confiance-dans-le-monde-openpgp#limitation-du-champ-des-trust-signatures)

I still can't make it work though!

FWIW gpg (GnuPG) 2.1.17
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