terraform variables and split function

gistfile1.txt

variable "subnet_cidr_blocks" {
  default = "192.168.0.0/24,192.168.1.0/24,192.168.2.0/24"
}

gistfile2.txt

resource "aws_subnet" "subnet_public" {
  cidr_block = "${split(",",var.subnet_cidr_blocks)}"
  
  ...
}