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<?php var_dump(preg_match_all('/#([^#\s]+)\b/', '#中文 tag 1 #tag3', $r)); var_dump($r);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) array(2) { [0]=> array(1) { [0]=> string(5) "#tag3" } [1]=> array(1) { [0]=> string(4) "tag3" } }