JavaScript String replaceAll() Method

The replaceAll() method in JavaScript is used to replace all occurrences of a specified substring or pattern with a new substring. The replaceAll() method does not change the original string.

JavaScript's replaceAll() method used for replacing all instances of a specified substring or pattern within a string with a new substring. This method comprehensively updates the string by replacing every occurrence of the target substring or pattern with the provided replacement string.

Note: The original string remains unchanged, preserving its integrity throughout the process.

Syntax:

const newString = originalString.replaceAll(regexp | substr , newSubstr | function)

Parameters:

This method accepts certain parameters defined below: 

• regexp: It is the regular expression whose matches are replaced with the newSubstr or the value returned by the specified function.
• substr: It defines the substrings which are to be replaced with newSubstr or the value returned by the specified function.
• newSubstr: It is the substring that replaces all the matches of the string specified by the substr or the regular expression.
• function: It is the function that is invoked to replace the matches with the regexp or substr.

Return Value:

Returns a String where the search value has been replaced.

Example 1: String Replace All Occurrences

The function gfg() takes a string "Geeks or Geeks", replaces all occurrences of "or" with "for", and logs the modified string "Geeks for Geeks" to the console.

Geeks for Geeks

Example 2: Replace All Occurrences of "coffee" with "tea"

The function GFG() defines a regular expression /coffee/ig to match all occurrences of "coffee" case-insensitively in the string "Lets, have coffee today!". It then replaces all occurrences with "tea" and logs the modified string "Lets, have tea today!" to the console.

Lets, have tea today!

We have a complete list of Javascript string methods, to check those please go through the Javascript String Complete Reference article.

Supported Browsers:

• Google Chrome 85
• Microsoft Edge 85
• Mozilla Firefox 77
• Opera 71
• Safari 13.1