export const SUBDOMAIN_MIN_LENGTH = 4; export const SUBDOMAIN_MAX_LENGTH = 63; export const SUBDOMAIN_PATTERN = /^[a-z0-9]([a-z0-9-]{2,61}[a-z0-9])?$/; export const isValidSubdomain = (value: string): boolean => value.length >= SUBDOMAIN_MIN_LENGTH && value.length <= SUBDOMAIN_MAX_LENGTH && SUBDOMAIN_PATTERN.test(value);