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JavaScript lastIndexOf() Method
JavaScript String Object
Definition and Usage
The lastIndexOf() method returns the position of the last found occurrence of a specified value in a string.
Note: The string is searched backward, but the index returned is the character position from left to right (starting at 0).
This method returns -1 if the value to search for never occurs.
Syntax
| Parameter | Description |
|---|---|
| searchstring | Required. The string to search for |
| start | Optional. The position where to start the search. If omitted, the default value is the length of the string |
Browser Support
The lastIndexOf() method is supported in all major browsers.
Tips and Notes
Note: The lastIndexOf() method is case sensitive!
Tip: Also look at the indexOf() method.
Examples
Example 1
Do different searches within a string:
var str="Hello world!";
document.write(str.lastIndexOf("d") + "<br />");
document.write(str.lastIndexOf("WORLD") + "<br />");
document.write(str.lastIndexOf("world"));
</script>
The output of the code above will be:
-1
6
Try it yourself »
Example 2
Differences between indexOf and lastIndexOf:
var str="I love W3Schools!"
document.write("Index of first o: " + str.indexOf("o"))
document.write("<br />")
document.write("Index of last o: " + str.lastIndexOf("o"))
document.write("<br />")
document.write("Index of first 'love': " + str.indexOf("love"))
document.write("<br />")
document.write("Index of last 'love': " + str.lastIndexOf("love"))
</script>
The output of the code above will be:
Index of last o: 13
Index of first 'love': 2
Index of last 'love': 2
Try it yourself »
JavaScript String Object
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