Question

In terminologies related to regular expressions which of the following is false about terms and operators?

(a) Terms are strings or substrings

(b) Operators combine terms and expressions

(c) Operators do not have precedence

(d) Operators have precedence like arithmetic operators

The question was asked during a job interview.

This key question is from Motif and Domain Databases Using Regular Expressions in chapter Sequence Alignment of Bioinformatics

Answer 1

Correct choice is (c) Operators do not have precedence

Easy explanation: For harmonious, efficient and error-free functioning of the matching preocess, operators have precedence in order to set the priority of the operations to be carried out during the alignment.