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【单选题】
RegularExpressionValidator控件中可以加入正则表达式，下面选项用来描述用字符A或B开头，后面为六位数字的字符串模式的正则表达式正确的是（ ）。A.
[A-B]\w{6}
B.
[A|B][0-9]{6}
C.
A|B\d6
D.
[A-B][0-9]6
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