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<?php $content="@asdfasdf @你好"; $matches=null; preg_match_all('/@[\S].+? /', $content, $matches); var_dump($matches);
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [0]=> array(1) { [0]=> string(10) "@asdfasdf " } }

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167.29 ms | 404 KiB | 183 Q