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;
}
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