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Regular expressions are closed under _____________

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Regular expressions are closed under _____________

(a) Union

(b) Intersection

(c) Kleene star

(d) All of the mentioned

I have been asked this question in an interview for job.

Question is taken from Regular Grammar topic in section Contextfree Grammar and Syntax Analysis of Compiler

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Correct option is (d) All of the mentioned

The best explanation: According to the definition of regular expression.

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