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.
JavaScript String replaceAll() Method Examples
Example 1: String Replace All Occurrences
The function gfg()
takes a string “Beginner or Beginner”, replaces all occurrences of “or” with “for”, and logs the modified string “Beginner for Beginner” to the console.
function gfg() {
let string = "Beginner or Beginner";
newString = string.replaceAll("or", "for");
console.log(newString);
}
gfg();
Output
Beginner for Beginner
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.
function GFG() {
const regexp = /coffee/ig;
let string = "Lets, have coffee today!";
newString = string.replaceAll(regexp, "tea");
console.log(newString);
}
GFG();
Output
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 Browser:
- Google Chrome 85 and above
- Microsoft Edge 85 and above
- Mozilla Firefox 77 and above
- Opera 71 and above
- Safari 13.1 and above
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