Currently, in Zoho Desk, we can only validate field values using standard criteria. When will Zoho Desk give us the option to validate fields using a custom function like Zoho CRM does? Given that Zoho CRM already has this, I would think this would not be terribly difficult to implement in Zoho Desk. Here is the option from CRM:

Please let us know when Zoho is planning to have this same option inside Zoho Desk.