Regex not filtering out what I expect it to

I have a custom filter function which is supposed to filter out all telephone numbers not beginning with either a 2 followed by 9 digits or a 69 followed by 8 digits. The function is supposed to be validating a form with a tel* field named “Telephone”. What I’ve put in my contact form is the following:

[text Name id:Name_ba placeholder "Ονοματεπώνυμο"]

[tel* Telephone id:Telephone_ba placeholder "Τηλέφωνο *"]

[email Email id:Email_ba placeholder "Το email σου"]

What I’ve put in the functions.php of my child theme is the following:

add_filter('wpcf7_validate_tel', 'custom_phone_validation', 20, 2);
add_filter('wpcf7_validate_tel*', 'custom_phone_validation', 20, 2);

function custom_phone_validation($result, $tag) {
    $type = $tag->type; 
    $name = $tag->name; 

    if($name == 'Telephone') {
        $value = $_POST[$name];
        if(!preg_match("/^(2)[0-9]{9}$|^(69)[0-9]{8}$/i", $value )){ 
            $result->invalidate($tag, "Φαίνεται σα να μην πληκτρολογήσατε ένα έγκυρο τηλέφωνο.");
        }
    }
    return $result;
}

I have tested with a text input on the tel field, and in that case the filter works as expected. However when I enter a phone like 9925142491 it’s not.

What is it that I am doing wrong?