subdomain_of?(other) -> bool
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other が self のサブドメインであるかどうかを返します。
require "resolv" domain = Resolv::DNS::Name.create("y.z") p Resolv::DNS::Name.create("w.x.y.z").subdomain_of?(domain) #=> true p Resolv::DNS::Name.create("x.y.z").subdomain_of?(domain) #=> true p Resolv::DNS::Name.create("y.z").subdomain_of?(domain) #=> false p Resolv::DNS::Name.create("z").subdomain_of?(domain) #=> false p Resolv::DNS::Name.create("x.y.z.").subdomain_of?(domain) #=> false p Resolv::DNS::Name.create("w.z").subdomain_of?(domain) #=> false