From http://www.w3schools.com (Copyright Refsnes Data)

JavaScript lastMatch Property

RegExp Object Reference Complete RegExp Object Reference

Definition and Usage

The lastMatch property is the last matched characters.

Syntax

RegExp.lastMatch

Example

In the following example we will see the last match from the string:

<script type="text/javascript">
var str = "The rain in Spain stays mainly in the plain";
var patt1 = new RegExp("ain");

patt1.test(str);
document.write("Match found: " + RegExp.lastMatch);
</script>

Try it yourself »
RegExp Object Reference Complete RegExp Object Reference

From http://www.w3schools.com (Copyright Refsnes Data)