Exclude hosts based on regexp contraint

Nomad
5

a minimal job definition of what I am attempting:
(btw, bare word node.class works the same as "${node.class}")

job "updater" {
  type        = "sysbatch"
  region      = "us-west-2"
  datacenters = ["us-west-2"]

  constraint {
    attribute = node.class
    operator  = "regexp"
    value     = "^[^(special)]"
  }

  group "updater" {
    task "updater" {
      driver = "raw_exec"

      config {
        command = "/usr/bin/uptime"
      }

      env {
        foo = "1"
      }

    } # task
  }   # group
}     # job