$webnah = Parse($String, '<table class="shedule changes">', '</table>');
$html = $webnah;
$dom = new DOMDocument;
$dom->loadXML($html . '</table>');
$content = '';
$xpath = new DOMXPath($dom);
foreach ($xpath->query('//td[.="КП-19-25"]/..') as $row) {
$content .= $dom->saveXML($row) . PHP_EOL;
}
echo $content;