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<?php $hashtag = '#আয়াতুল_কুরসি'; preg_match('/#[\w\p{M}]+/u', $hashtag, $matches); print_r($matches);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => #আয়াতুল_কুরসি )

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