isValidEmailDomain static method
Check if string is a valid email domain
domain - The domain to validate
Returns true if domain is valid
Implementation
static bool isValidEmailDomain(String domain) {
final domainRegex = RegExp(r'^[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?)*$');
return domainRegex.hasMatch(domain);
}