regex - Can domain name have two continuous hyphens -


i looked couple of questions on so, seem suggest 2 continuous hyphens (e.g. my--website.com) not allowed when search same domain name on http://www.register.com/index.rcmx, gladly accepts name while rejects non valid domain names my#website.com.
validation url/domain using regex? (rails)

it's legal in domain name, , required internationalised domain names (idns) when converted unicode ascii end prefixed xn--


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