Question

What does the subexpression /java(script)?/ result in?

(a) It matches “java” followed by the optional “script”

(b) It matches “java” followed by any number of “script”

(c) It matches “java” followed by a minimum of one “script”

(d) It matches “java” followed by a single “script”

I have been asked this question during an online exam.

This interesting question is from Pattern Matching and Regular Expressions topic in portion Classes and Modules in JavaScript of JavaScript

Answer 1

Right choice is (a) It matches “java” followed by the optional “script”

For explanation: paranthesis () check for the optional presence of the argument in the string. subexpression /java(script)?/ matches “java” followed by the optional “script”.