preg_match 匹配mac地址
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$isMac = preg_match("/^[A-F0-9]{2}:[A-F0-9]{2}:[A-F0-9]{2}:[A-F0-9]{2}:[A-F0-9]{2}:[A-F0-9]{2}$/i", $mac);
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$isMac = preg_match("/00:e0:c2:e1:a3:85/i", $mac);
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