Scalr\Model\Entity\Role::isValidName PHP Method

    public static function isValidName($name)
    {
        return !!preg_match('/^[A-Za-z0-9]+[A-Za-z0-9-]*[A-Za-z0-9]+$/i', $name);
    }

 public function ServerImageCreate($ServerID, $RoleName)
 {
     $this->restrictAccess(Acl::RESOURCE_IMAGES_ENVIRONMENT, Acl::PERM_IMAGES_ENVIRONMENT_MANAGE);
     $this->restrictAccess(Acl::RESOURCE_ROLES_ENVIRONMENT, Acl::PERM_ROLES_ENVIRONMENT_MANAGE);
     $DBServer = DBServer::LoadByID($ServerID);
     // Validate client and server
     if ($DBServer->envId != $this->Environment->id) {
         throw new Exception(sprintf("Server ID #%s not found", $ServerID));
     }
     $this->user->getPermissions()->validate($DBServer);
     //Check for already running bundle on selected instance
     $chk = $this->DB->GetOne("SELECT id FROM bundle_tasks WHERE server_id=? AND status NOT IN ('success', 'failed') LIMIT 1", array($ServerID));
     if ($chk) {
         throw new Exception(sprintf(_("Server '%s' is already synchonizing."), $ServerID));
     }
     if (!Role::isValidName($RoleName)) {
         throw new Exception(_("Role name is incorrect"));
     }
     if (Role::isNameUsed($RoleName, $this->user->getAccountId(), $this->Environment->id)) {
         throw new Exception("Specified role name is already used by another role");
     }
     if ($btId = BundleTask::getActiveTaskIdByName($RoleName, $this->user->getAccountId(), $this->Environment->id)) {
         throw new Exception(sprintf("Specified role name is already reserved for BundleTask with ID: %d.", $btId));
     }
     $ServerSnapshotCreateInfo = new ServerSnapshotCreateInfo($DBServer, $RoleName, SERVER_REPLACEMENT_TYPE::NO_REPLACE, BundleTask::BUNDLETASK_OBJECT_ROLE, 'Bundled via API');
     $BundleTask = BundleTask::Create($ServerSnapshotCreateInfo);
     $BundleTask->createdById = $this->user->id;
     $BundleTask->createdByEmail = $this->user->getEmail();
     $BundleTask->save();
     $response = $this->CreateInitialResponse();
     $response->BundleTaskID = $BundleTask->id;
     return $response;
 }