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Valid domain name regex including internationalized domain name
domain_regex = r'(([\da-zA-Z])([_\w-]{,62})\.){,127}(([\da-zA-Z])[_\w-]{,61})?([\da-zA-Z]\.((xn\-\-[a-zA-Z\d]+)|([a-zA-Z\d]{2,})))'
domain_regex = '{0}$'.format(domain_regex)
valid_domain_name_regex = re.compile(domain_regex, re.IGNORECASE)
self.domain_name = self.domain_name.lower().strip().encode('ascii')
if re.match(valid_domain_name_regex, self.domain_name ):
return True
return False
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