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domain regex

/^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9].[a-zA-Z]{2,}$/
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regex domain

^((?!-))(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,})$
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