Hello,

I'm making an Oxwall plugin, I created a form with textarea in a new class like this :

class LAVSMS_CLASS_SmsSendForm extends Form
{  
    public function __construct($name)
    {  
        parent::__construct($name);
      
        $this->fieldMessage = new Textarea('message');
        $this->fieldMessage->setLabel(OW::getLanguage()->text( 'lavsms', 'send_form_message' ));
        $this->fieldMessage->setRequired();
        $this->addElement($this->fieldMessage);
      
        $this->fieldRecipients = new CheckboxGroup('recipients');
        $this->fieldRecipients->setLabel(OW::getLanguage()->text( 'lavsms', 'send_form_recipients' ));
        $this->fieldRecipients->setRequired();
        $this->addElement($this->fieldRecipients);
      
        $this->submit = new Submit('send');
        $this->submit->setValue(OW::getLanguage()->text( 'lavsms', 'send' ));
        $this->addElement($this->submit);
    }
}

In my controller, I call the class like this :

$sendForm = new LAVSMS_CLASS_SmsSendForm('sendForm');      
        $sendForm->fieldRecipients->addOption( 'followers', OW::getLanguage()->text('lavsms', 'send_form_followers') );
        $sendForm->fieldRecipients->addOption( 'followersEteq', OW::getLanguage()->text('lavsms', 'send_form_followersEteq') );
        $this->addForm($sendForm);

And display the form in html file like this:

{form name='sendForm'}
    <table class="ow_table_1 ow_form ow_automargin" style="width: 80%;">
       <tr class="ow_alt1 ow_tr_first">
            <td class="ow_label">{label name='recipients'}</td>
            <td class="ow_value">{input name='recipients'}{error name='recipients'}</td>
        </tr>
       <tr class="ow_alt2">
            <td class="ow_label">{label name='message'}</td>
            <td class="ow_value">{input name='message'}{error name='message'}</td>
        </tr>
    </table>
    <div class="clearfix ow_stdmargin ow_automargin" style="width: 500px;">
        <div class="ow_right">{submit name='send' class='ow_button ow_ic_right_arrow2'}</div>
    </div>
    {/form}

When the form is posted, I try to check the message field data with a regex like this :

if ( OW::getRequest()->isPost() )
        {
            if ( $sendForm->isValid($_POST) )
            {
                $data = $sendForm->getValues();

                $messagePattern = '/^[0-9A-Za-zÄÖÜѧàèé@&_ \/+,:;.!?\"\'\n*()<>=-]{1,100}$/';
              
                if (preg_match($messagePattern, htmlspecialchars($data['message'])))
                {
                    $message = htmlspecialchars($data['message']);
                }
            }
        }

But the last steps does not work. When I input a special character (ÄÖÜѧàèé)
 or a new line (\n) in the message field preg_match() systematicaly returns "false".
I tested my regex on two WEB testers like https://regex101.com/, it matches all the characters and new lines corretly.
I also tested it on one of my sites and preg_match return "true" instead "false" for the same string.
From there, I though of a charset problem. I tried to force utf8 by adding the following in .htaccess :

 <FilesMatch "\.(htm|html|xhtml|xml|css|js|php)$">
AddDefaultCharset utf-8
</FilesMatch>

No luck there either.

Now i'm running out of ideas and I'm kind of stuck. It seems to me the textarea does not post special characters correctly but I don't know how to be sure or where to fix it in Oxwal if that is the case.

Could anyone please help me find out what is going on or propose another way to restrict my field data?

Thank you for any help.