Terraform variable validation

validation variable validation

variable "aws_region" {
 type        = string
 description = "region used to deploy workloads"
 default     = "us-east-1"
 validation {
   condition     = can(regex("^us-", var.aws_region))
   error_message = "The aws_region value must be a valid region in the USA, starting with \"us-\"."
 }
}

• Since Terraform 1.2 (2022): precondition and postcondition added for improving code and input validation

See also

• Terraform variables, types, env variables, variables.tf, .tfvars, nullable, validation, terraform.tfvars

https://www.hashicorp.com/blog/custom-variable-validation-in-terraform-0-13