RegularExpression: match and extract long domain

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RegularExpression: match and extract long domain



I want to match and extract domain form strings,and I got an equation:


result = re.findall(r"(^((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}.(xn--)?([a-z0-9-]{1,61}|[a-z0-9-]{1,30}.[a-z]{2,})$)", text)



It does well for domain like :


example.org
example.org.eu



but it cannot work for domain like :


sub_example.example.org.eu



so,I am asking for helping improving the equation.









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