...
Maximum Length
Allowed maximum length of text value.
Input Mask
Allowed input mask. You should use 9 for [0-9], a for [a-Z], * for [0-a-Z].
Dynamic Rules
Through this button you can add two types of rules to the text box control. Click one of them and you will see it is listed above the button. It has two buttons to edit and delete the rule.
...