-- function to validate job options
function validate_job (job_desc)
  if job_desc.array_inx ~= nil then
    ak, av = string.match(job_desc.array_inx, "^(%d+)-(%d+)$")
    if ak == nil or av == nil then
      slurm.log_user('--array/-a option have to be a range of values with a "-" separator, ex.: 0-14')
      slurm.log_error("slurm_job_submit: invalid array index: %s",job_desc.array_inx)
      -- 2081 == ESLURM_INVALID_ARRAY
      return 2081
    end
  end
end