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run code in 200+ php & hhvm versions
Bugs & Features
<?php $m = []; preg_match('/feed_id=(\d+)/', 'https://www.only4kids.dk/index.php/gomage_feed/index/generate/?isAjax=true&feed_id=15&form_key=mPMJZ2mErWGfIvWP', $m);
based on pDRWB
Output for 5.6.38 - 7.3.0rc3