$re = '/<div class="row container-items">(.+?)\n\n<\/div>/us';
$str = '<div class="row container-items">
<div class="col-xs-4 col-sm-4 col-md-4 col-lg-4 col-center-block">
<div class="panel panel-default">
<div class="panel-body image-panel">
<a href="/p/{% p_link %}">
<div class="item_image">
<img src="/data/sorted/{% image_src %}">
</div>
</a>
</div>
<div class="panel-footer">
<div class="panel-heading category_view">
<div class="text-left">
<font color="#777">{% item_category %}</font>
</div>
<div class="text-right">{% count_view %}</div>
</div>
<!--<div class="caption_view">
{% item_caption %}
</div> -->
<a href="/p/{% p_link %}">посмотреть...</a>
</div>
</div>
</div>
<div class="col-xs-4 col-sm-4 col-md-4 col-lg-4 col-center-block">
<div class="panel panel-default">
<div class="panel-body image-panel">
<a href="/p/{% p_link %}">
<div class="item_image">
<img src="/data/sorted/{% image_src %}">
</div>
</a>
</div>
<div class="panel-footer">
<div class="panel-heading category_view">
<div class="text-left">
<font color="#777">{% item_category %}</font>
</div>
<div class="text-right">{% count_view %}</div>
</div>
<!--<div class="caption_view">
{% item_caption %}
</div> -->
<a href="/p/{% p_link %}">посмотреть...</a>
</div>
</div>
</div>
</div>';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php