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snippets/articles/s/js-replace-all-occurences-of-string.md

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+---
+title: Replace all occurrences of a string in JavaScript
+shortTitle: Replace all occurrences of a string
+type: story
+language: javascript
+tags: [string,regexp]
+author: chalarangelo
+cover: blue-computer
+excerpt: If you need to replace all occurrences of a string in JavaScript, you have a couple of options.
+dateModified: 2022-07-03T05:00:00-04:00
+---
+
+### String.prototype.replaceAll()
+
+Modern JavaScript engines have a built-in method called `String.prototype.replaceAll()`. This method can be used to replace all occurrences of a string in another string with relative ease.
+
+```js
+const str = 'Hello World';
+
+str.replaceAll('o', 'x'); // 'Hellx Wxrld'
+```
+
+Using `String.prototype.replaceAll()` is the recommended approach, as it's straightforward. If, however, you need to support older browsers, consider the option below.
+
+### String.prototype.replace()
+
+Before the introduction of `String.prototype.replaceAll()`, `String.prototype.replace()` was the method of choice for this sort of task. It's supported by all JavaScript engines, old and new and is very similar to `String.prototype.replaceAll()`.
+
+While this method doesn't replace all occurrences of a string, it supports regular expressions. Knowing the string to be replaced, a regular expression can be created with the global (`'g'`) flag. Then, it can be passed to `String.prototype.replace()` to replace all occurrences of the string. The only issue here is that special characters need to be escaped, so that they are matched correctly. The [escapeRegExp snippet](/js/s/escape-reg-exp) comes in handy for this task.
+
+```js
+const escapeRegExp = str => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+const replaceAll = (str, subStr, newSubStr) =>
+  str.replace(new RegExp(escapeRegExp(subStr), 'g'), newSubStr);
+
+const str = 'Hello World';
+
+replaceAll(str, 'o', 'x'); // 'Hellx Wxrld'
+```