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<?php $s = "Huawei MatePad 11 (2021)"; $regex = "/\(([^()]+)\)|\h+/"; $result = preg_replace_callback($regex, function($m) { return array_key_exists(1, $m) ? $m[1] : '-'; }, $s); echo $result;
Output for git.master, git.master_jit, rfc.property-hooks
Huawei-MatePad-11-2021

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