3v4l.org

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<?php var_dump(preg_match_all('/#(\w+)\b/', 'tag1 41654 tag 1 tag3', $r)); var_dump($r);
Output for 4.3.0 - 7.1.0
int(0) array(2) { [0]=> array(0) { } [1]=> array(0) { } }