单项选择题
A.update tableB.alter tableC.create tebleD.以上都不对
A.\\w+(\\.)\\w+(\\.)\w+B.w{\\.}\w+(\\.)\w+C.\\w+@\\w+(\\.)\\w+D.www{\\.}\w+(\\.)\w
A.[0-9a-z]B.[a-z]+C.[A-Z0-9]D.[0-9]