- CoursesSale
- Tutorials
- Practice
- Jobs
Regular Expressions
Question 1
What does the g flag in a regular expression do?
- A
Makes the search case-insensitive
- B
Enables the search to stop after the first match
- C
Searches for all matches globally
- D
Allows the use of groups in the regular expression
Question 2
Which method tests if a string matches a pattern and returns true or false?
- A
exec()
- B
test()
- C
match()
- D
search()
Question 3
What will the following code output?
const regex = /\d+/g;
console.log("abc123xyz456".match(regex));
- A
["123", "456"]
- B
[123, 456]
- C
["abc", "xyz"]
- D
Error
Question 4
How do you validate an email address using regular expressions?
- A
Use the pattern /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/
- B
Use the pattern /^\w+@\w+\.\w+$/
- C
Use the pattern /[a-z]+/
- D
Use the pattern /\d+/
Question 5
What is the purpose of the exec() method in RegExp?
- A
Searches a string for a pattern and returns its index
- B
Returns a boolean indicating if a match is found
- C
Splits a string into an array based on a pattern
- D
Returns an array of match details or null if no match is found
Question 6
What will the following code log?
const regex = /a+b*/;
console.log(regex.test("aaabb"));
- A
true
- B
false
- C
null
- D
Error
Question 7
Which method can replace all occurrences of a pattern in a string?
- A
replaceAll()
- B
replace()
- C
match()
- D
exec()
Question 8
What is the purpose of the search() method in strings?
- A
Returns an array of matches
- B
Finds the index of the first match
- C
Validates a regular expression pattern
- D
Replaces the first match with a new string
Question 9
What does the i flag in a regular expression do?
- A
Makes the search case-insensitive
- B
Searches for all matches globally
- C
Stops the search after the first match
- D
Allows the use of groups in the regular expression
Question 10
Which method is used to check if a string matches a regular expression pattern?
- A
exec()
- B
match()
- C
search()
- D
test()
There are 10 questions to complete.