link counting

i thought of an idea of counting the number of links to reduce comment spam. unfortunately my methods is not reliable, i haven't tested it yet though.. anyone have maybe a better solution using some regexp? $links = array('http://', 'https://', 'www.'); $total_links = 0; foreach($links as $link) {

    $total_links = substr_count($string, $link);

}

      if($total_links > X)

{ ..... }