How to Replace all Occurrences of a String in JavaScript

How to Replace all Occurrences of a String in JavaScript? | Using JavaScript RegEx(), Spilt() & Join() Methods

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How to Replace all Occurrences of a String in JavaScript?

There are two proper ways to replace all occurrences of a string in JavaScript. Below, we have described them neatly including an example program. Okay, Let’s have a look at these methods and learn the javascript program to replace all occurrences of a string.

  1. Using a Regular Expression (RegEx)
  2. Using JavaScript Split() and Join() method

Using a Regular Expression (RegEx)

String.replace(/<TERM>/g, '')

This works as a case sensitive substitution.

For example,

const phrase = "I love my dog! Dogs are great";
const stripped = phrase.replace(/dog/g, "");
console.log(stripped);

The output would be

I love my ! Dogs are great

To perform a case insensitive replacement, use the i option,

const phrase = "I love my dog! Dogs are great";
const stripped = phrase.replace(/dog/gi, "");
console.log(stripped);

The output would be

I love my ! s are great

NOTE: Remember that if the string contains some special characters, it won’t play well with regular expressions, so the suggestion is to escape the string using this function.

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Using JavaScript Split() and Join() method

An alternative solution, albeit slower than the regex, is using two JavaScript functions.

The first is split(), which truncates a string when it finds a pattern (case sensitive), and returns an array with the tokens:

const phrase = "I love my dog! Dogs are great";
const tokens = phrase.split("dog").join();

console.log(tokens);

The final output would however be the same. (case sensitive)

I love my ! Dogs are great