JavaScript lastIndex Property
 Complete RegExp Object Reference
Definition and Usage
The lastIndex property specifies the index (placement) in the string where to
start the next match.
The index is a number specifying the placement of the first character after
the last match.
This property only works if the "g" modifier is set.
Syntax
Example
In the following example we will see the index of the string after a match is
found:
<script type="text/javascript">
var str = "The rain in Spain stays mainly in the plain";
var patt1 = new RegExp("ain", "g");
patt1.test(str);
document.write("Match found. index now at: " + patt1.lastIndex);
</script>
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Try-It-Yourself Demos
lastIndex
How to use lastIndex property to check where to start the next match.
Complete RegExp Object Reference
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