Zend FR

<form method="post" action="#insc" name="insc" id="insc">
<fieldset>
<legend>Infos :</legend>
 <p><label for="pseudo">Mon pseudo : </label><input type="text" size="20" name="pseudo" id="pseudo" value="" /></p>
 <p><label for="cgu" class="checkbox"><input type="checkbox" id="cgu" name="cgu" value="1" /> Checked</label></p>

<p><input type="submit" name="submit" value="ok" /></p>
</fieldset>
</form>

if(!empty($_POST['submit'])) { 
   $filtres = array(
   '*' => 'StringTrim',
   );
   
           
  $validateurs = array (
    
        'pseudo' => array(array('Regex','(^[-_0-9a-zA-Z]{4,15}$)'),'messages' => array(Zend_Validate_Regex::NOT_MATCH => "Votre pseudo doit contenir entre 4 et 15 caractéres alphanumériques ou les caractères -, _.")),
    
        'cgu' => array('digits','messages' => 
                                  array(
                                   Zend_Validate_Digits::NOT_DIGITS   => 'Cocher la case',
                                                     Zend_Validate_Digits::STRING_EMPTY => 'Cocher la case car vide.'
                                  )
        )
  );
 
   $input = new Zend_Filter_Input($filtres, $validateurs,$_POST);
     
    if ($input->isValid()) {
         //To be continued
        } else {    
        //Récupére les erreurs    
        foreach ($input->getMessages() as $item){ $erreur[] = $item[0];}  
      } 
  
    }