Registration form validation.

That's not possible in the core UI.

But assuming you're a coder and have grasped the basics of Drupal development:

You'll need to create a custom module implementing hook_form_alter to specify a new validation function, which will call form_set_errors with $reset=TRUE.

http://api.drupal.org/api/function/form_set_error/6
http://api.drupal.org/api/file/developer/topics/forms_api.html

You can use hook_form_alter on pre-exisiting forms. That's its point.

http://api.drupal.org/api/function/hook_form_alter/6

When you call form_set_error() with $rest=TRUE, it should remove the 'default' error messages, so you can insert your own in their place.

The links I provided weren't intended to walk you through a solution; they provide the general background information you'll need to understand in order to implement the solution I suggested.

Everyone says Drupal has a steep learning curve, and everyone who follows through with it has said it was worth it.

Good Luck!

@Sandymaguire: Did you manage to implement your changes using matt2000's pointers?

- Arie

form_set_errors() populates $messages .

You're going about it the hard way, but if you really want to do that, use drupal_get_messages() :

http://api.drupal.org/api/function/drupal_get_messages/6

But really, use hook_form_alter() and form_set_errors(). Anything else is a waste of time that you will probably regret later.

@Sandymaguire: Any luck in resolving this issue yet?

- Arie

I have a far from perfect solution, but it works for me (I'm using drupal 6).
In the "Webforms advanced Setting"/"Additional validation" field of the webform put the following code:

<?php
// if the form raised one or more errors, $hashFormErrors will be populated
$hashFormErrors = form_get_errors();

// delete ALL drupal errors
drupal_get_messages('error');

// now add your own error message
if (! empty($hashFormErrors)) {
    form_set_error('', t('Please check the highlighted fields.'));
}
?>

Please note that this code suppresses the output of every Drupal error, not only errors raised by the webform module nor "mandatory field" errors only. So you will have to validate some fields by yourself, as all the messages from the module are gone.

Hope this helps.

Closing this issue because of a lack of activity.