extract shortcodes from string

Where is this string located ? I know you wrote "without wordpress system" , but WordPress has a function get shortcode regex

If you really want to avoid it for some reason, the following example might help you :

// check the post for a short code function check_shortcode( $shortcode = NULL ) { $post_to_check = get_post( get_the_ID() ); // Until we search, set false $found = false; // no short - FALSE if ( ! $shortcode ) { return $found; } // check the post content for the short code if ( stripos( $post_to_check->post_content, '[' . $shortcode) !== FALSE ) { // we have found the short code $found = TRUE; } // return our final results return $found; }