JavaScript String replace() Method
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JavaScript String replace() Method
The replace() method returns a new string with some or all matches of a pattern replaced by a replacement.
Note: The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.
Using String
Note: If pattern is a string, only the first occurrence will be replaced.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "Tiger is king of the jungle";
var result = str.replace("Tiger", "Lion");
document.write(result);
</script>
</body>
</html>
Syntax
str.replace(find, replaceWith)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| find | Required | To find the characters in your string which is to be replaced. Use string or regexp to find the characters to be replaced. |
| replaceWith | Required | The value to replace the find values. Use string or function to replace the 'find value' in the string. |
Return Value
| Value | Explanation |
|---|---|
| string | Returns a new string, where specific or all matches of a pattern replaced by a replacement. |
Using RegExp
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "He is good and he likes her.";
var result = str.replace(/he/g, "she");
document.write(result);
</script>
</body>
</html>
Using Function for Replacement
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "ai means Artificial intelligence";
var result = str.replace("ai", function (x) {
return x.toUpperCase();
});
document.write(result);
</script>
</body>
</html>
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