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// http://dreamhelg.ru/2010/02/15-regular-expression-for-web-developers/

// Поиск любых тегов
function get_tag( $tag, $xml ) {
  $tag = preg_quote($tag);
  preg_match_all('{<'.$tag.'[^>]*>(.*?)</'.$tag.'>.'}',
                   $xml,
                   $matches,
                   PREG_PATTERN_ORDER);
 
  return $matches[1];
}