[rules-users] negation for matches

Folks, How can I negate the matches?, like for those that don't match certain criteria do that I tried something like this but it doesn't work: rule "SupplierView: Supplier code's first two characters should be numeric." when $s : SupplierView(!(suppCode matches "\\d\\d.*")) then ValidationErrorFacade.getInstance().registerError($s, new ValidationError("Supplier code's first two characters should be numeric.")); end Thanks, -Sergey ********************** ** LEGAL DISCLAIMER ** ********************** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer.