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Validation of singleline/short response, url, regex...
On a single line answer type it would be nice to have validation:
- IBAN
- own Regular Expression
Edit (@jotoeri):
- Numeric only #605
Yes, that would be good.
"Date" should be a separate question type though just like it is in Google Forms: https://github.com/nextcloud/forms/issues/14
Crowdsignal (a service I use and pay for) implements this as predefined form fields - which is the same approach as you mentioned @jancborchardt.
See below:

The labels, and format are then customisable:

for me, this approach makes sense as it focuses on what I want to gather - email, telephone, date, etc.
I would like to see this feature in future as well :)
Would be nice to have regex allowed for individual questions, for example, I'd like to limit character length for certain questions using [\w]{1,140}