MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Order of precedence: Kleene star has the highest precedence, followed by concatenation, and then union. For example, 0∪10∗ is short for 0∪(1(0∗)). The language of a regular expression R is defined recursively.

Detailed explanation-2: -In regular expressions, the ‘ * ‘, ‘ + ‘, and ‘ ? ‘ operators, as well as the braces ‘ ‘ and ‘ ‘, have the highest precedence, followed by concatenation, and finally by ‘ | ‘. As in arithmetic, parentheses can change how operators are grouped.

Detailed explanation-3: -(i) The regular expression operators have the following order of precedence (in decreasing order): star, concatenation, union.; 0 + 10 means 0 + (10), not (0 + 1)0.

Detailed explanation-4: -Closure has the highest precedence, followed by concatenation, followed by union.

Detailed explanation-5: -Kleene closure (plural Kleene closures) (mathematics, computer science) The set of all strings of finite length made up of elements of a given set. ( Then the Kleene closure is said to be of that given set.