Custom Field - Regex Validation

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.4.39

It would be great if we were able to add a custom text field and be able to apply regex validation. Just making the field required doesn't prevent the customer from entering incorrect information.

I appreciate you adding in this capability with 2.5.0, however, I cannot get it to work. I changed my custom field from Text to Custom Text, put in the regex and saved. Now there is no textbox for the customer to enter a value into and the product cannot be added to the shopping cart. Only the field label and the asterisk is shown. I cannot even revert the field back to Text, as that dropdown is not shown anymore for that field.

EDIT: Actually the product was added to the cart, but there was not the usual add to cart notice. There was also no warning about an invalid entry. Since there is no textbox, and thus no value entered, I would have expected some validation error being shown, but there wasn't.

OK, I've got the field back to a text entry, but I had to change the field type in the database. I have my regex entered, but the validation fails, even for a valid entry.

My regex is: /[A-Z]{4}[0-9]+-[A-Z0-9]{4}-[A-Z0-9]{5}-[A-Z0-9]{4}-[A-Z0-9]{4}/i

A value of XXXX14-123D-E1234-567T-435H should be accepted, but fails validation. I ran the regex through an online tester and the regex worked as expected.

Thanks, I got it working. It would be nice if when a new version is released if it included updated documentation. I see nothing about the regex feature in the current documentation.