You update the settings from the admin panel but you still have to update the templates manually.
It could probably be done but everytime you changed your fields you'd have to update the javascript in the templates. Also quite a lot of people have javascript disabled.
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it could be possible to generate javascript to validate the input on the user side before being sumitted to the server : could test the lenght, the regex, the not null/requiredIt could probably be done but everytime you changed your fields you'd have to update the javascript in the templates. Also quite a lot of people have javascript disabled.