variable "host_name" {
  default     = "hello-world"
  description = "The host name for the Linode instance."
  type        = string

  validation {
    condition     = can(regex("^[a-zA-Z0-9-]+$", var.host_name))
    error_message = "The host name can only contain alphanumeric characters and hyphens."
  }
}