<html>
<body>
<script type="text/javascript">
var str="Hello world!";
document.write(str.search("world") + "
");
document.write(str.search("World") + "
");
document.write(str.search("woorld") + "
");
</script>
</body>
</html>
This result:
6
-1
-1
If string for search certain in source in search string it return index of position
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