optional behavior: validate instead of replace

You can implement this yourself by writing a custom form validation handler and running wordfilter_filter_process() directly against a form value. If the returned text is not equal to the original text you could act on this and fail validation for the form field perhaps.

Any suggestions on what this might look like. I've been trying to figure out how to validate using Wordfilter.

I needed this so I created a very small module called wordfiler_plus. Here's the code. Add an info file and rename the module/functions as needed. Work is still needed to integrate with CCK and provide a more helpful error message. I hope this helps someone in the mean time.

/**
 * Implementation of hook_perm().
 */
function wordfilter_plus_perm() {
  return array('skip banned word check');
}

/**
 * Implementation of hook_nodeapi().
 */
function wordfilter_plus_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  switch ($op) {
    case 'validate':
      if(!user_access('skip banned word check')) {
	    // Run node body through word filter. Any words matching the word filter
	    // list will be modified.
	    $filtered_body = wordfilter_filter_process($node->body);
        
	    // Compare filtered $node->body to not filter $node->body.
	    // If there are different we know that a banned word is present.
	    if ($node->body != $filtered_body) {
	      form_set_error('body', t('This text contains a banned word.'));
	    }
	  }
	break;
  }
}

I also chucked this code up on GitHub is anyone is interested. See http://github.com/rickvug/wordfilter_plus. If this gets into a workable state maybe I'll make a patch to wordfilter for better integration or throw the code up on d.o. Anyone is welcome to fork and improve.

Check out this code:
http://websites-development.com/blog/bad-words-validation-drupal

Also see this sandbox: http://drupal.org/sandbox/rickvug/1072642. If anyone is interested please contact me about becoming a co-maintainer. Should this become useful we can transition the sandbox to be a full project with releases.