azurerm_netapp_account SMB server name check is too restrictive

[lucaghersi]

Terraform (and AzureRM Provider) Version:

• Terraform v0.15.1
• Provider hashicorp/azurerm v2.57.0

Affected resource:

• azurerm_netapp_account

Configuration file example:

resource "azurerm_netapp_account" "dev-netapp-fs-gwc-001" {
  name                = "dev-netapp-fs-gwc-001"
  resource_group_name = azurerm_resource_group.dev-rg-netapp-fs.name
  location            = local.germany_west_central

  active_directory {
    username            = "netappfs"
    password            = data.azurerm_key_vault_secret.netappfs-user-password.value
    smb_server_name     = "FP-AFS-"
    dns_servers         = ["10.101.32.36", "10.101.32.37"]
    domain              = "XXX.XX"
    organizational_unit = "OU=Azure,OU=FileServer,OU=Server"
  }
}

Expected Behaviour:

I would expect this resource to be created.

Actual Behaviour:

Error: invalid value for active_directory.0.smb_server_name (The smb server name can not be longer than 10 characters in length.)

The smb_server_name regex is too restrictive and does not allow a computer name that includes any character other than digits or letters (capital and not capital) while instead is perfectly fine to use other characters in the portal.
The error message is also confusing as, in fact, the string length is below 10 in length.

https://github.com/terraform-providers/terraform-provider-azurerm/blob/9d5d4dcc7ef9a350981565614b6b3d72874bbf2a/azurerm/internal/services/netapp/netapp_account_resource.go#L75

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