SearchDoubleProps

CModule::IncludeModule('iblock');

/*Параметры*/
$IBLOCK_ID = 3;
$PROP = 'COUNTRY_LIST';

$res = CIBlockElement::GetList(array(), array('IBLOCK_ID' => $IBLOCK_ID, /*"=PROPERTY_{$PROP}" =>'Россия'*/), false, false, array('PROPERTY_'.$PROP, 'ID'));
$current = "";
$count = $res->SelectedRowsCount();
while($ob = $res->GetNext())
{
    //$current .= $ob["PROPERTY_{$PROP}_VALUE"]."\n";
    CIBlockElement::SetPropertyValues($ob['ID'], $IBLOCK_ID, 118, $PROP);
}
//Работа с экспортом данных
/*$file = 'REGION.txt';
file_put_contents($file, var_export($current, true));*/

echo 'Количество найденны строк: '.$count;