JavaScript: Escape a string to use in a regular expression

JavaScript fundamental (ES6 Syntax): Exercise-239 with Solution

Write a JavaScript program to escape a string to use in a regular expression.

  • Use String.prototype.replace() to escape special characters.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const escapeRegExp = str => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

Sample Output:



flowchart: Escape a string to use in a regular expression.

Live Demo:

See the Pen javascript-basic-exercise-239-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to calculate the factorial of a number.
Next: Write a JavaScript program that will return true if the parent element contains the child element, false otherwise.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";


includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv