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<? $arDetText = $Elem['~DETAIL_TEXT'];?>
                    <?preg_match('/<table .* id="shkaf">[\S\s]*?<\/td><\/tr>[\s]*<\/tbody>[\s]*<\/table>/Uix',$arDetText,$Match);?>
                    <?=$Match;?>

 <?=$Match[0];?> 

<ul> 
<? 
$arSelect = Array("ID", "NAME", "DETAIL_TEXT", "DETAIL_PAGE_URL");
    $arFilter = Array("!ID" => $arResult['ID'], "IBLOCK_ID"=>32, "ACTIVE" => "Y",);
    $res = CIBlockElement::GetList(Array("RAND"=>"ASC"), $arFilter, false, Array("nTopCount"=>3), $arSelect);
   
    while($ob1 = $res->GetNextElement()) 
    {
        $Elem = $ob1->GetFields();
        
    ?>
        <li>
            <div">
                <a href="<?=$Elem["DETAIL_PAGE_URL"];?>"> 

                    <Здесь требуется выводить кусок кода из DETAIL_TEXT> 

                </a>
            </div>
            <div>
                <a href="<?=$Elem["DETAIL_PAGE_URL"];?>">
                    <?=$Elem["NAME"];?>
                </a>
                            
            </div>
        </li>
    
    <? } ?>
 </ul>

preg_match('/<table .* id="shkaf">[\S\s]*?<\/td><\/tr>[\s]*<\/tbody>[\s]*<\/table>/Uix',$Elem['DETAIL_TEXT'],$Match);