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<?php $str='Rsds'; var_dump($str); $a = preg_replace('/[^A-Za-z0-9áéíóúñÁÉÍÓÚÑ]+/u', '', $str); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
string(4) "Rsds" string(4) "Rsds"

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