Display a set_message for each bad wor found in string

When the user types in a couple of word lets say ban and bad in string.

How could I get my set_message() to out put error message for each word found.

Currently only displays one message.

PHP Code:

<?php

class MY_Form_validation extends CI_Form_validation {

    public function badword($string) {
        // Dummy words
        $badWords = array("ban","bad","user","pass","stack","name","html");
        $matches = array();
        $matchFound = preg_match_all("/\b(" . implode($badWords,"|") . ")\b/i", $string, $matches);

        if ($matchFound) {
              
              $words = array_unique($matches[0]);
              
              foreach($words as $word) {
                  $this->set_message('badword', 'Your message has a band word <b>' . $word . '</b> you can not use that word.');
              }

              return false;
        
        } else {

            return true;
        }

    }
} 


There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!