Description:
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1. input one or more of the german äÄöÖüÜß in a html form 30 times (= max length)
2. Submit $_POST['passwort']
3. You get an error ("Fehler")

The same with i.E. 30 digits or a-Z doesnt produce an error.

An input of german äÄöÖüÜß less then 30 times doesnt produce an error.

A really not so nice fault ;-)

Perhaps the fault is corresponding with utf-8

Test script:
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header("Content-Type: text/html; charset=utf-8");
if( (!@(preg_match('/^[0-9a-zA-ZäÄöÖüÜß&?!%@#,\.:_=+-]{1,30}$/',$_POST['passwort']))) ) echo 'Fehler';