ok, I understand the tradeoff that was made here.. was thinking about using a regex like this:

^(?!.*-$)^[a-z][a-z-]{0,79}$

However this uses a negative lookup that is not supported by go. So second best is to go for a length of 2:

^[a-zA-Z0-9])([a-zA-Z0-9-]{0,78})([a-zA-Z0-9]$

Or split the check up into 2 steps, one for starting and ending with a '-' character and a allowed character regex : ^[a-zA-Z0-9-]{1,80}

I could use some advice on what to implement. I prefer the last one. as this resembles the actual behaviour from the portal.

Hey @rikribbers - the 2nd option would be fine :)

This has been released in version 2.23.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.23.0"
}
# ... other configuration ...

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