s.pageName        = "Garden: Sheds & Storage: Wooden Sheds";

if (preg_match("/s.pageName = "(.*?)"/", $html, $matches)) {

    var_dump($matches);


}

$text = <<<EOT
s.pageName        = "Garden: Sheds & Storage: Wooden Sheds";
EOT;

if (preg_match('/s.pageNames+=s+"(.*?)";/', $text, $matches)) {
    var_dump($matches);
}

(?<=pageNames=s").+(?=";)