By Samir Pipalia | 10/28/13 3:01 AM | - | Added by Per Henrik Lausten
Validators allows you to validate wide variety of field values for email, IP address, URL, ISBN and credit card (AMEX, Diners, Discover, Master and VISA) using a simple Java class. Internally Validators uses Apache Commons Validator.
This technique was originally described in this blog: http://www.pipalia.co.uk/xpages-2/using-validator-property-to-keep-all-your-validations-in-a-single-java-class/.