checkPublicSuffix("a.b.ide.kyoto.jp", "b.ide.kyoto.jp")
    checkPublicSuffix("c.kobe.jp", null)
    checkPublicSuffix("b.c.kobe.jp", "b.c.kobe.jp")
    checkPublicSuffix("a.b.c.kobe.jp", "b.c.kobe.jp")
    checkPublicSuffix("city.kobe.jp", "city.kobe.jp")
    checkPublicSuffix("www.city.kobe.jp", "city.kobe.jp")
    // TLD with a wildcard rule and exceptions.
    checkPublicSuffix("ck", null)

*.dweb.link *.elb.amazonaws.com *.elb.amazonaws.com.cn *.er *.ex.futurecms.at *.ex.ortsinfo.at *.firenet.ch *.fk *.frusky.de *.futurecms.at *.gateway.dev *.hosting.myjino.ru *.hosting.ovh.net *.in.futurecms.at *.jm *.kawasaki.jp *.kh *.kitakyushu.jp *.kobe.jp *.kunden.ortsinfo.at *.landing.myjino.ru *.lcl.dev *.lclstage.dev *.linodeobjects.com *.magentosite.cloud *.migration.run *.mm *.moonscale.io *.nagoya.jp *.nodebalancer.linode.com *.nom.br *.northflank.app *.np *.oci.customer-oci.com *.ocp.customer-oci.com...