ES6 - String Method replace()


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This method finds a match between a regular expression and a string, and replaces the matched substring with a new substring.

The replacement string can include the following special replacement patterns −

Sr.No Patterns & Inserts
1

$$

Inserts a "$".

2

$&

Inserts the matched substring.

3

$`

Inserts the portion of the string that precedes the matched substring.

4

$'

Inserts the portion of the string that follows the matched substring.

5

$n or $nn

Where n or nn are decimal digits, inserts the nth parenthesized submatch string, provided the first argument was a RegExp object.

Syntax

string.replace(regexp/substr, newSubStr/function[, flags]);

Argument Details

  • regexp − A RegExp object. The match is replaced by the return value of parameter #2.

  • substr − A String that is to be replaced by newSubStr.

  • newSubStr − The String that replaces the substring received from parameter #1.

  • function − A function to be invoked to create the new substring.

  • flags − A String containing any combination of the RegExp flags: g.

Return Value

It simply returns a new changed string.

Example

var re = /apples/gi; 
var str = "Apples are round, and apples are juicy."; 
var newstr = str.replace(re, "oranges"); 
console.log(newstr)   

Output

oranges are round, and oranges are juicy.    

Example

var re = /(\w+)\s(\w+)/; 
var str = "zara ali"; 
var newstr = str.replace(re, "$2, $1"); 
console.log(newstr);

Output

ali, zara

es6_strings.htm

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