<!DOCTYPE html>
<html>
<body>
<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>
</body>
</html>