Valid domain name regex including internationalized domain name

valid_domain_name_regex

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,})))'

#Python
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
else:
    return False

Awesome