When will you have support for field validation based on regular expression?

Something beyond the masking currently provided is desperately needed.

I kindly ask you give us more details, on which form and what do you intend to achieve so we can try to find the best solution for this.

Thank you

I'd be glad to.
We have a budget code field, which we would like to validate with the following regular expression:
/^(?!10-73480)(?!10-51725)(?!10-75900)[135]0-\d{5}-\d{4}$/
Here is the form link:
http://form.jotform.us/form/40895626779171
Field label:
Enter your ministry's budget account code. Please contact your team's accountant if you don't know it.
Thanks
________________________________
...

Hi,

That's is not possible in the form builder as of the moment but you can achieve that when you take your form source code and apply your custom regular expression.

If you need further assistance with this, let us know here and we'd be happy to assist.

Regards!