在仅由字符a、b构成的所有字符串中，其中以b结尾的字符串集合可用正规式表示为（ ）。
- A.(b|ab)*b
- B.(ab*)*b
- C.a*b*b
- D.(a|b)*b
正确答案及解析
正确答案
解析
首先所有选项都是以b结尾的，但只有选项D中的 (a|b)*可以表示{ε，a，b，aa，ab......}由字符a、b构成的所有字符串。
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