Custom field validation

Summary

Custom field validation

Content

Hello,

I am using VBCS on trial environment.

I am working on some POC.

One of the requirement is i need to make a custom validation.

For example, I want to validate an input text if its having an "IBAN" format or not.
For example : in my country a valid IBAN should start with "JO" and its 24 Digits.
How to achieve this in VCBS ?

Thanks in advance,
Amro