TOPIC: Fields with Validation Rules

Hi,

First of all I appreciate the ongoing improvements of this nice component.

Is there any way to add a validations rules for a specific fields? Let's say that I create fields on which trought SSL I prefer to keep, beside the name and other information, the Credit Card numbers in order to process the payment later on at the office, instead use any of the actual payments.

Problem is when I create a field, such as a Text, no way to introduce any validation rule, so that, the register can introduce any other value than just numbers.

Thanks for your comments

would love to know more about the text validation too.

If i want for example only a special text to be entered, how would i set it up?