Description:
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:
| Pattern | Inserts |
| $$ | Inserts a "$". |
| $& | Inserts the matched substring. |
| $` | Inserts the portion of the string that precedes the matched substring. |
| $' | Inserts the portion of the string that follows the matched substring. |
| $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]);
|
Here is the detail of parameters:
- 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 - global match, i - ignore case, m - match over multiple
lines. This parameter is only used if the first parameter is a string.
Return Value:
- It simply returns a new changed string.
Example:
Following example shows how to use the global and ignore case flags
which permits replace to replace each occurrence of 'apples' in the
string with 'oranges'.
<html>
<head>
<title>JavaScript String replace() Method</title>
</head>
<body>
<script type="text/javascript">
var re = /apples/gi;
var str = "Apples are round, and apples are juicy.";
var newstr = str.replace(re, "oranges");
document.write(newstr );
</script>
</body>
</html>
|
Example:
Following example shows how to switch words in a string:
<html>
<head>
<title>JavaScript String replace() Method</title>
</head>
<body>
<script type="text/javascript">
var re = /(\w+)\s(\w+)/;
var str = "zara ali";
var newstr = str.replace(re, "$2, $1");
document.write(newstr);
</script>
</body>
</html>
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