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If a regular expression includes unary operator (*), concatenation, and then Which of the following statements is TRUE?

If a regular expression includes unary operator (*), concatenation, and then Which of the following statements is TRUE? Correct Answer <span style="">Concatenation</span> has lowest precedence and is left associative

The correct answer is option 4.

Concept:

Regular Expression:

The language accepted by finite automata can be easily described by simple expressions called Regular Expressions. It is the most effective way to represent any language. Regular-expression notations have the operations of union, concatenation, and Kleene closure(*).

Precedence and associativity of the regular-expression operators:

  • The regular-expression operator star (*) has the highest precedence and is left associative.
  • The regular-expression operator concatenation has the next highest precedence and is left associative.
  • The regular-expression operator + has the lowest precedence and is left associative.

Example:

Thus the regular expression a + b*c would be grouped a + ((b*)c).

Hence the correct answer is concatenation has the lowest precedence and is left-associative.

Related Questions

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"Which of the following two statements are correct regarding Chinese policy of "Theory of Palm and five fingers"?
1. It includes Bhutan and Nepal
2. It includes Arunachal Pradesh, Sikkim and Laddakh
3. It includes Mizoram and Manipur
4. It includes Tripura and Nagaland
Choose the correct answer from the options given below."
Which of the following two statements are correct regarding Chinese policy of "Theory of Palm and five fingers"?
1. It includes Bhutan and Nepal3. It includes Mizoram and Manipur
4. It includes Tripura and Nagaland
Choose the correct answer.
Which of the following two statements are correct regarding Chinese policy of "Theory of Palm and five fingers"?
1. It includes Bhutan and Nepal
2. It includes Arunachal Pradesh, Sikkim and Laddakh
3. It includes Mizoram and Manipur
4. It includes Tripura and Nagaland
Choose the correct answer from the options given below.