MyBB Importer : convertContentToBbCode wrong embedded attachment id

[K a M a L]

Affected version

1.5.1

The MyBB importer has a bug that ruined my last migration
at method convertContentToBbCode
there is a call

$content = preg_replace('#\[attachment=(\d)+]#siU', '[ATTACH=full]$1[/ATTACH]', $content);

this converted [attachment=26549] to [ATTACH=full]9[/ATTACH]
because the capture group captures only the last digit
it should be

$content = preg_replace('#\[attachment=(\d+)]#siU', '[ATTACH=full]$1[/ATTACH]', $content);