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<?php preg_match_all("/(?<=<tr>)(.+?)(?=<\/tr>)/is",$table,$rows); ?>

Добыл табличку с данными о погоде с сайта gismeteo. В итоге имеем html следующего содержания:

<table> <thead> <tr> <th class="wtlogo">&nbsp;</th> <td class="weekend">19.02<strong>СБ</strong></td> <td class="weekend">20.02<strong>ВС</strong></td> <td>21.02<strong>ПН</strong></td> <td>22.02<strong>ВТ</strong></td> <td>23.02<strong>СР</strong></td> <td>24.02<strong>ЧТ</strong></td> <td>25.02<strong>ПТ</strong></td> <td class="weekend">26.02<strong>СБ</strong></td> <td class="weekend">27.02<strong>ВС</strong></td> <td>28.02<strong>ПН</strong></td> <td>01.03<strong>ВТ</strong></td> <td>02.03<strong>СР</strong></td> </tr> </thead> <tbody> <tr class="cloudness"> <th>Облачность</th> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c3.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c2.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c3.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.c0.gif" alt=""></td> </tr> <tr class="persp"> <th>Осадки</th> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.s2.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.s2.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.s1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.s1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.s1.gif" alt=""></td> <td><img src="http://i.gismeteo.com/static/images/icons/old/d.r0.gif" alt=""></td> </tr> <tr> <th>Температура днем&deg;C</th> <td class="t-20">-15&deg;</td> <td class="t-15">-13&deg;</td> <td class="t-15">-14&deg;</td> <td class="t-20">-15&deg;</td> <td class="t-15">-10&deg;</td> <td class="t-10">-8&deg;</td> <td class="t-15">-10&deg;</td> <td class="t-15">-11&deg;</td> <td class="t-10">-8&deg;</td> <td class="t-5">-4&deg;</td> <td class="t-5">-3&deg;</td> <td class="t-10">-5&deg;</td> </tr> ...

Но достать данные по группам с помощью

preg_match_all('|<tr>(.+)</tr>|U', $table, $rows);

не получается...

да, этот код не будет действовать на элементы таблицы, у которых есть классы стилей, но в данном коде есть и чистые <tr>, содержание которых не забирается