Das kommt auch nicht dahinein, sondern unter "Logik" in die "Frage-Validierungsgleichung".
Dort kann man im "Hinweis" auch sagen, was falsch ist.
Steht auch im Handbuch, dass die Validierung dort, wo Du sie eingetragen hast, für "Regular Expressions" ist. Lass aber auch diese dort weg.
www.limesurvey.org/manual/Question_type_-_Short_free_text
a.
Validation (using regular expressions) (preg_validation)
Description
This option lets you specify a regular expression with which you can validate all the parts of a question.
If any question or subquestion value does not meet the validation requirements, the background colour of the text entry field will be changed to red so that users can easily see which parts of the question need to be corrected. Thus, you can do on-page validation. In this way you will not need to wait for the user to click on the submit button to validate the respective question.
Valid values
Any valid regular expression
b.
Question validation equation (em_validation_q)
Description
This is an equation that is used to validate the entire question (e.g, all of its parts collectively for a multi-answer question). If the question fails the validation criteria, then em_validation_q_tip message will be displayed (it uses the CSS style .error). This tip uses the .em_q_fn_validation CSS style, which is hidden by default within template.css.
The main difference between this feature and the subquestion validation equations (em_validation_sq option) is that for this feature, if the question (or question parts) fail validation, then an error message could be shown. For the subquestion validation, each text entry cell (e.g., in an array question type, but it can also be applied to single entry question types) will be styled so that the background color is (light) red.
Valid values
Any equation that makes use of the ExpressionScript syntax, without surrounding curly braces.
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