Check if short-code exists in page and echo something inside Wordpress dashboard

Check-if-shortcode-exists-in-page-and-echo-something

/**
 * Check if shortcode exists in page and echo something in Wordpress dashboard
 */
function check_if_shortcode_exists_in_page_and_echo_something()
{
    global $post;
    if (function_exists('get_current_screen')
        && function_exists('has_shortcode')
        && function_exists('is_admin')
    ) {
        $screen = get_current_screen();
        if (isset($screen)) {
            if (is_admin() && ($screen->id == 'page') && has_shortcode($post->post_content, 'shortcode-name')) {
                echo "Do somethig"
            }
            if (is_admin()) {
                echo "Something else"
            }
        }
    }
}

/**
* The hook
*/
add_action('admin_notices', 'check_if_shortcode_exists_in_page_and_echo_something');