TYPO3 Core

HI Remo, i found this documentation: https://docs.typo3.org/m/typo3/reference-tca/master/en-us/ColumnsConfig/Type/inputDefault.html?highlight=eval#id15 I think "alpha" is correctly documented.

My opinion: If we include the umlauts in this list, other eval functions are also affected, then we would have to consider other languages/characters. Example: Chinese, Greece or something else.

There is a hook and you can define your own "alpha" eval function:

$value = preg_replace('/[^a-zäöüA-ZÄÖÜß]/', '', $value);

Maybe this will help you?

Yes, thank you! I will use the hook then.

Well, the term alphabet only applies to Latin letters: \p{Latin} (maybe used together with \p{L})