Find filter

function print_filters_for( $hook = '' ) {
    global $wp_filter;
    if( empty( $hook ) || !isset( $wp_filter[$hook] ) )
        return;
 
    print '<pre>';
    print_r( $wp_filter[$hook] );
    print '</pre>';
}
 
// global $shortcode_tags;
// print_r($shortcode_tags);