ProcessCheckResultCommandForm: Use substr instead of pregmatch

refs #9672

modules/monitoring/application/forms/Command/Object/ProcessCheckResultCommandForm.php

@@ -124,7 +124,7 @@ class ProcessCheckResultCommandForm extends ObjectsCommandForm
             ProcessCheckResultCommand::HOST_DOWN => $this->translate('DOWN', 'icinga.state')
         );
 
-        if (! preg_match('~^v2\.\d+\.\d+.*$~', $this->getBackend()->getProgramVersion())) {
+        if (substr($this->getBackend()->getProgramVersion(), 0, 2) !== 'v2') {
             $options[ProcessCheckResultCommand::HOST_UNREACHABLE] = $this->translate('UNREACHABLE', 'icinga.state');
         }