JavaScript leftContext Property
 Complete RegExp Object Reference
Definition and Usage
The leftContext property is the substring in front of the characters most
recently matched.
This property contains everything from the string from before the match.
Syntax
Example
In the following example we will see the text from the string in front of the last match:
<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("Text before match: " + RegExp.leftContext);
</script>
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Complete RegExp Object Reference
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