Error: only lowercase alphanumeric characters, hyphens, underscores, periods, and spaces allowed in "name"

╷
│ Error: only lowercase alphanumeric characters, hyphens, underscores, periods, and spaces allowed in "name"
│
│   with module.db.aws_db_subnet_group.this[0],
│   on .terraform/your_module/pathto.tf line 4, in resource "aws_db_subnet_group" "this":
│    4:   name       = "${var.db_subnet_group_name}"
│
╵

Error: only lowercase alphanumeric characters and hyphens allowed in "XXXXX"

See also

• terraform plan: [ -refresh-only | -lock=false | -target | -var-file | will be created | --help], Terraform plan errors, Terraform plan examples, Terraform plan execution errors, (known after apply)