3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $content = <<<CONTENT @tag CONTENT; $matches = array(); var_dump(preg_match('/\A\w*@/', substr($content, 0)) === 1);
based on f0tjM
Output for 4.3.0 - 7.2.0
bool(false)