nl_tokens: Perform the actual validation .
pl_tokens: public ValidatorMessageHolder validate ( Object fieldValue , String fieldLabel ) { ValidatorMessage validatorMessage = new ValidatorMessage ( ) ; if ( fieldValue == null ) { return validatorMessage ; } int len = Boon . len ( fieldValue ) ; if ( ! ( len >= <mask> && len <= max ) ) { populateMessage ( validatorMessage , fieldLabel , min , max ) ; } return validatorMessage ; }