IT tutor

Which modifier performs case-insensitive matching in regular expressions?

(a)  

What does the regular expression pattern [0-9] match?

• Any letter from a to z

• Any digit from 0 to 9

• Any special character

• Any whitespace character

Which metacharacter matches a digit in regular expressions?

(a)  

What does the quantifier n+ match?

• Zero or more occurrences of n

• Exactly one occurrence of n

• At least one occurrence of n

• Zero or one occurrence of n

JavaScript Methods and Objects

What does the test() method of RegExp return?

• The matched text

• The index of the match

• true or false

• A new string

What will "Hello world!".repeat(2) return?

• "Hello world!Hello world!"

• "Hello world!2"

• "Hello world! Hello world!"

• An Error

• None of the Above

What does the exec() method return when no match is found?

• false

• 0

• null

• undefined

Which variable declaration cannot be reassigned?

(a)  

What does x <<= y do?

• Left shifts x by y bits and assigns result to x

• Right shifts x by y bits and assigns result to x

• Multiplies x by y

• Divides x by y

Which assignment operator is equivalent to x = x + y?

(a)