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<?php $token = 'áéíèàùñÑêÊäÄöÖüÜçÇØøÉéÆæÅåÄäÖöひらがな< >'; echo (mb_eregi('^[^!@\[\]\{\}<>?=]+$', $token) !== false) ? 'safe' : 'unsafe';
Output for git.master, git.master_jit, rfc.property-hooks
unsafe

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