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JavaScript lastIndex Property
JavaScript RegExp Object
Definition and Usage
The lastIndex property specifies the index at which to start the next match.
Note: This property only works if the "g" modifier is set.
This property returns an integer that specifies the character position immediately after the last match found by exec( ) or test( ) methods.
Note: exec( ) and test( ) reset lastIndex to 0 if they do not get a match.
Syntax
RegExpObject.lastIndex
Browser Support
The lastIndex property is supported in all major browsers.
Example
Example
Do a global search for "ain" in a string, and output the index after a match is found:
<script type="text/javascript">
var str="The rain in Spain stays mainly in the plain";
var patt1=/ain/g;
while (patt1.test(str)==true)
{
document.write("'ain' found. Index now at: "+patt1.lastIndex);
document.write("<br />");
}
</script>
var str="The rain in Spain stays mainly in the plain";
var patt1=/ain/g;
while (patt1.test(str)==true)
{
document.write("'ain' found. Index now at: "+patt1.lastIndex);
document.write("<br />");
}
</script>
Try it yourself »
JavaScript RegExp Object
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Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
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Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.