var contact = new Backbone.Model({
firstName:'John',lastName:'Doe',phone:0
});
contact.validate = function(attributes,options){
var validPhone = /\(?\d{3}\W?\s?\d{3}\W?\d{4}/.test(attributes.phone);
if(!validPhone){
return 'Setting or Saving Invalid Phone Number Attempted';
}
}
contact.set('phone','111-111-1111',{validate:true}); //will set
contact.set('phone','111-1-1111',{validate:true}); //will not set, fails validation
console.log(contact.get('phone')); //no invalid phone number was set
console.log(contact.validationError); //read last validation error