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$s =<<< TXT
<div class="dddd"></div>
//其它内容
<div class="11">aaaaa</div>
//其它内容
<div class="11">bbbbb</div>
//其它内容
<div class="11">cccccc</div>
//其它内容
<div class="11">ddddd</div>
//其它内容
TXT;
preg_match_all('@<div class="11">(.*)</div>@', $s, $m);
print_r($m);
Array
(
[0] => Array
(
[0] => <div class="11">aaaaa</div>
[1] => <div class="11">bbbbb</div>
[2] => <div class="11">cccccc</div>
[3] => <div class="11">ddddd</div>
)
[1] => Array
(
[0] => aaaaa
[1] => bbbbb
[2] => cccccc
[3] => ddddd
)
)