如何对变量值强制使用特定模式

我认为terraform的最新实验功能之一应该可以帮助您：

variable "email" {
  type = string

  validation {
    condition = can(regex("^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$", var.email))
    error_message = "ERROR: Not a valid email"
  }
}

https://www.terraform.io/docs/configuration/functions/can.html

此功能需要满足以下条件：

terraform {
  experiments = [variable_validation]
}

https://www.terraform.io/docs/configuration/variables.html#custom-validation-rules