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<?php
 
$s = "#早上";
preg_match_all('/(?<!\S)#\w*\p{L}\w*/u', $s, $m);
print_r($m);

Success #stdin #stdout 0.01s 52488KB

stdin

Standard input is empty

stdout

Array
(
    [0] => Array
        (
            [0] => #早上
        )

)

https://ideone.com/6rfenQ

language:

PHP (php 7.3.5)

created:

visibility:

secret

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