Modify error message from validator

[José Antonio Mora Pérez]

I applied a validator in a text field that can only contains 5 digits (regular expression: [0-9]{5}). My problem is, ¿how do I change the message the user sees? Because "X field is not [0-9]{5}" gives no information.

Thanks in advance!

[José Antonio Mora Pérez]

Up. Still need an answer for this...