Code:
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$(function
(){
var Shift
= false;
$(
"#str").keyup(function
(k
){
if(k.keyCode
==16){
Shift
= false;
}
var t
= $(
this).val();
var u
= t.
replace(/[^a-z0-9]+/gi,
"");
$(
this).val
(u
);
}).keydown(function
(k
){
if(k.keyCode
==16){
Shift
= true;
}
if((k.keyCode
>=48&&k.keyCode
<=57)
&&Shift
==true){
k.preventDefault
();
}
})
});
</script>
</head>
<body>
<input id=
"str"><br>
<span id="d">
</body>
</html>
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