librenms-librenms/includes/polling/os/iosxr.inc.php

<?php

if (preg_match('/^Cisco IOS XR Software \(Cisco ([^\)]+)\),\s+Version ([^\[]+)\[([^\]]+)\]/', $poll_device['sysDescr'], $regexp_result))
{
  $hardware = $regexp_result[1];
  $features = $regexp_result[3];
  $version = $regexp_result[2];
}
else
{
  # It is not an IOS-XR ... What should we do ?
}

$serial = get_main_serial($device);

echo("\n".$poll_device['sysDescr']."\n");