JavaScript String lastIndexOf() Method
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JavaScript String lastIndexOf() Method
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Reference
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❮ JavaScript String Reference
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Search a string for the last occurrence of "planet":
var str = "Hello planet earth, you are a great planet.";
var n = str.lastIndexOf("planet");
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The result of n will be:
var str="Hello planet earth, you are a great planet.";
document.write(str.lastIndexOf("planet"));
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The lastIndexOf() method returns the position of the last occurrence of a specified value in a string.
Note: The string is searched from the end to the beginning, but returns the index starting at the beginning, at position 0.
This method returns -1 if the value to search for never occurs.
Note: The lastIndexOf() method is case sensitive!
Tip: Also look at the indexOf() method.
Browser Support
| Method | |||||
|---|---|---|---|---|---|
| lastIndexOf() | Yes | Yes | Yes | Yes | Yes |
Syntax
string.lastIndexOf(searchvalue, start)
Parameter Values
| Parameter | Description |
|---|---|
| searchvalue | Required. The string to search for |
| start | Optional. The position where to start the search (searching backwards). If omitted, the default value is the length of the string |
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Technical Details
| Return Value: | A Number, representing the position where the specified searchvalue occurs for the last time, or -1 if it never occurs |
|---|---|
| JavaScript Version: | ECMAScript 1 |
More Examples
Example
Search a string for the last occurrence of "planet", starting the search at position 20:
var str = "Hello planet earth, you are a great planet.";
var n = str.lastIndexOf("planet", 20);
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The result of n will be:
var str="Hello planet earth, you are a great planet.";
document.write(str.lastIndexOf("planet",20));
Try it Yourself »
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Reference
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❮ JavaScript String Reference
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