$re = '/<script[^>]+>[\s|\S]*(\'facebook-jssdk\'\)\);
\/\/ ]]><\/script>)/';
$str = '<p><em>ขอขอบคุณข้อมูลจาก <a href="https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3">เฟซบุ๊ก Crewabs Cabincrew</a></em></p>
<script type="text/javascript"></script>asdasd
asdasdasd
asdad
<script type="text/javascript">// <![CDATA[
(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/th_TH/sdk.js#xfbml=1&version=v2.3"; fjs.parentNode.insertBefore(js, fjs);}(document, \'script\', \'facebook-jssdk\'));
// ]]></script>
<div class="fb-post" data-href="https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3" data-width="500">
<div class="fb-xfbml-parse-ignore">
<blockquote cite="https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3">
<p>จากใจแอร์สาวบนไฟล์ทที่โดนหนุ่มรถไฟจีบด้วยมุก"ระเบิด"กรณีหนุ่มรถไฟ แซวแอร์ไทยไลอ้อน อยากขอพื้นที่ชี้แจงให้ลูกเรือสาวในไ...</p>
Posted by <a href="https://www.facebook.com/CrewabsCabincrew/">Crewabs Cabincrew</a> on <a href="https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3">3 พฤศจิกายน 2015</a></blockquote>
</div>
</div>
</div>
</div>';
preg_match($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