fix(AttachmentService): make regex in getAttachmentIdsFromContent more permissive

Signed-off-by: Peter Birrer <peter.birrer@optonic.com>

Author: pbirrer

lib/Service/AttachmentService.php

@@ -608,9 +608,9 @@ function ($node) use ($contentAttachmentFileIds, $contentAttachmentNames) {
 	 */
 	public static function getAttachmentIdsFromContent(string $content): array {
 		$matches = [];
-		// matches [ANY_CONSIDERED_CORRECT_BY_PHP-MARKDOWN](ANY_URL/f/FILE_ID[ (preview)]) and captures FILE_ID
+		// matches [ANY_CONSIDERED_CORRECT_BY_PHP-MARKDOWN](ANY_URL/f/FILE_ID and captures FILE_ID
 		preg_match_all(
-			'/\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[\])*\])*\])*\])*\])*\])*\]\(\S+\/f\/(\d+)(?: \(preview\))?\)/',
+			'/\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[\])*\])*\])*\])*\])*\])*\]\(\S+\/f\/(\d+)/',
 			$content,
 			$matches,
 			PREG_SET_ORDER