TYPO3 Core

Forgot to write: After refreshing (F5) the page is displayed. The page that was created shows a simple 5-column table with download links for files. What I also noticed is that the alt text and target _blank are deleted after repeated saving.

Looks like an error occurred in using preg_replace(), for whatever reason:
https://www.php.net/manual/en/function.preg-replace.php#refsect1-function.preg-replace-returnvalues
Then $bodyDescription is set to null.

I tried to reproduce this but could not get the error you describe.

You seem to be using special configuration or plugins because you're using `<img>` tags in the RTE which isn't possible by default. Can you please also post your CKEditor YAML configuration?

To speed up debugging maybe we can check what's going on with the failing regular expression. Could you edit your file /var/www/html/vendor/typo3/cms-indexed-search/Classes/Indexer.php and in Line 877 replace this:

            $bodyDescription = preg_replace('/\s+/u', ' ', $indexingDataDto->body);
            // Shorten the string. If the database has the wrong character set,
            // the string is probably truncated again.
            $bodyDescription = \mb_strcut($bodyDescription, 0, $maxL, 'utf-8');

to this:

            $bodyDescription = preg_replace('/\s+/u', ' ', $indexingDataDto->body);
            $fp = fopen('/var/www/html/var/typo3temp/ckeditor.log', 'a');
            fwrite($fp, "Input bodyDescription:\n" . $indexingDataDto->body . "\n----After replacement:\n" . $bodyDescription . "\n====\n");
            // Shorten the string. If the database has the wrong character set,
            // the string is probably truncated again.
            $bodyDescription = \mb_strcut($bodyDescription, 0, $maxL, 'utf-8');

Then it should create a logfile in /var/www/html/var/typo3temp/ckeditor.log which you could post after saving and the error occurs.

You could try if this helps:

            $bodyDescription = (string) preg_replace('/\s+/u', ' ', $indexingDataDto->body);

This should prevent a possible preg_replace output to be null (but would then not index anything, so that's just a workaround for the PHP error, not a real fix).

Hello Garvin.
I have attached the ckeditor.log. I tested it a bit. The error only occurs when I link files. When I look at the log, it contains the content of the linked files.