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
正规式（a|b）*对应的正规集为{ε，a，b，aa，ab，…，所有由a和b组成的字符串}，结尾为b。
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