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<body>
<input type="text" id="t" onselect="os(event)"/>
<script language="javascript">
os = function(event){
event = event || window.event;
var which = event.currentTarget || event.srcElement;
var sv = which.value.substring(which.selectionEnd,which.selectionStart);
alert( which.value.indexOf(sv) );
}
</script>
</body>
var str = "123456789123456789";
var atChar = str.indexOf("23");
alert(atChar);