RegexFieldValidator validator = new RegexFieldValidator();
        validator.setExpression("^Sec.*");
        validator.setValidatorContext(new GenericValidatorContext(new Object()));
        validator.setFieldName("username");
        validator.setValueStack(ActionContext.getContext().getValueStack());
        validator.validate(testPerson);
        assertFalse(validator.getValidatorContext().hasErrors());
        assertFalse(validator.getValidatorContext().hasActionErrors());
        assertFalse(validator.getValidatorContext().hasActionMessages());
        assertFalse(validator.getValidatorContext().hasFieldErrors());