add_filter('the_content', 'mte_remove_unused_shortcode');
function mte_remove_unused_shortcode($content)
{ $pattern = mte_get_unused_shortcode_regex();
$content = preg_replace_callback( '/'. $pattern .'/s', 'strip_shortcode_tag', $content );
return $content;
}
function mte_get_unused_shortcode_regex() {
global $shortcode_tags;
$tagnames = array_keys($shortcode_tags);
$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
$regex = '\\[(\\[?)';
$regex .= "(?!$tagregexp)";
$regex .= '\\b([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*+(?:\\[(?!\\/\\2\\])[^\\[]*+)*+)\\[\\/\\2\\])?)(\\]?)';
return $regex;
}
?>
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