You can use DOMDocument, like this:
$html = file_get_contents( $url);
libxml_use_internal_errors( true);
$doc = new DOMDocument;
$doc->loadHTML( $html);
$xpath = new DOMXpath( $doc);
// A name attribute on a ???
$node = $xpath->query( '//div[@name="changeable_text"]')->item( 0);
echo $node->textContent; // This will print **GET THIS TEXT**