$re = '/<script[^>]*id="(?!pagespeed\b)[^"]+".*<\/script>/m';
$str = '<script sdfsvsv id="pagespeed".sdfsfgs</script>
<script ada id="adfa"adadf </script>
<scriptfdaad id="adfasdv"</script>';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php