I want to add a special character validation on a specfic field. Here I have my code but it does not work and there is no error.

function mymodule_form_alter(&$form, &$form_state, &$form_id) { 
   if ($form_id == 'registration_node_form') {
        $form['#validate'][] = 'mymodule_form_validate';        

function mymodule_form_validate($form, $form_state){
    if(isset ($form['field_employer_name']['und'][0]['value']['#default_value'])){
        $special_character_list = '[\'^£$%&*()}{@#~?><>,|=_+¬-]'; 
        if (preg_match($special_character_list, $form_state['field_employer_name']['und'][0]['value']['#default_value'])== 0) {
            form_set_error('field_employer_name', t('The specified form name contains one or more illegal characters. Spaces or any other special characters except dash (-) and underscore (_) are not allowed.'));

Please help. Thank You.

1 Answer 1


Try using Field Validation Module it simplifies your work!!

If you want to code it then check this post It solves the same issue

Try changing your code:

 $special_character_list = '\'^£$%&*()}{@#~?><>,|=_+¬\-\[\]';
  if(preg_match('/[' . $special_character_list . ']/',$form_state['field_employer_name']['und'][0]['value']['#default_value']) !== 0)
  • already use but not achieve Commented Nov 11, 2014 at 11:47
  • Did you checked the link post I shared Commented Nov 11, 2014 at 12:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.