w3resource logo

JavaScript lastIndex Property

JavaScript lastIndex Property : RegExp Object


Seondary Nav


The lastIndex property is a read/write integer of RegExp object specifies the index at which to start the next match.


Implemented in JavaScript 1.2



Example :

The following web document demonstrates how the lastIndex property can be used.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript Regexp lastIndex Property : Example-1</title>
<h1 style="color: red">JavaScript lastIndex constructor Property</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
// Declare a regular expression for “The”
// Declare a string.
str1 = "The Quick Brown Fox Jumps Over The Lazy Dog";
// Executes search for pattern match with exec() and store result in an array array1
array1 = rexp.exec(str1);
document.write("The pattern '"+array1[0] + "' is matched Next match starts at index : " + rexp.lastIndex);

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also :

JavaScript Core objects, methods, properties.


Looking for some other tutorial?