Mega Code Archive
RegExp $` (4)
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The RegExp.$` property represents the substring preceding the most recent pattern match.
This is the same as using the leftContext property.
<html>
<body>
<script language="JavaScript">
<!--
pat = /is*/g;
var str = "This is a test.";
myArray = pat.exec(str);
document.write("In the string: " + "<b>");
document.write("I know where the fish is tonight" + "</b><br><br>");
document.write("The RegExp.leftContext is: " + RegExp.leftContext);
-->
</script>
</body>
</html>
]]>