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Can I build a serializer that validates username and email existence on is_valid call?

guys! I have this serializer class for the user model class UserSerializer(serializers.ModelSerializer): username = serializers.RegexField("^(?=.{6,20}$)(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$") full_name = serializers.RegexField("^([a-zA-Z]{2,}\s[a-zA-Z]{1,}’?-?[a-zA-Z]{2,}\s?([a-zA-Z]{1,})?)") email = serializers.EmailField() phone = serializers.RegexField("^(\+\d{1,2}\s?)?1?\-?\.?\s?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$") class Meta: model = User fields = [‘username’, ‘full_name’, ’email’, ‘password’, ‘phone’] This is my serializer class for the moment. I want to validate that the username and email does not […]