change FQDN check back slightly to avoid allowing mistyped IPs like 1…

…0.0.0.500

src/cnaas_nms/db/settings_fields.py

@@ -19,7 +19,7 @@
     r"[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|"  # 1::3:4:5:6:7:8   1::3:4:5:6:7:8  1::8
     r":((:[0-9a-fA-F]{1,4}){1,7}|:))"
 )
-HOSTNAME_REGEX = r"^([a-zA-Z0-9-]{1,63})(\.[a-zA-Z0-9-]{1,63})*$"
+HOSTNAME_REGEX = r"^([a-zA-Z0-9-]{1,63})(\.[a-zA-Z-][a-zA-Z0-9-]{0,62})*$"
 HOST_REGEX = f"^({IPV4_REGEX}|{IPV6_REGEX}|{HOSTNAME_REGEX})$"
 DOMAIN_NAME_REGEX = r"^([a-zA-Z0-9-]{1,63})(\.[a-zA-Z0-9-]{1,63})+$"
 host_schema = Field(..., pattern=HOST_REGEX, max_length=253, description="Hostname, FQDN or IP address")