Java Script:
<script type = "text/javascript">
var isShift=false;
function isAlphaNumeric(keyCode)
{
if (keyCode == 16)
isShift = true;
return (((keyCode >= 48 && keyCode <= 57) && isShift ==false) || (keyCode >= 65 && keyCode <= 90) || keyCode == 8 || keyCode == 35 || keyCode == 36 || keyCode == 37 || keyCode == 39 || keyCode == 46 || (keyCode >= 96 && keyCode <= 105));
// 8 - Backspace Key
// 35 - Home Key
// 36 - End Key
// 37 - Left Arrow Key
// 39 - Right Arrow Key
// 46 - Del Key
}
function KeyUp(keyCode)
{
if (keyCode == 16)
isShift = false;
}
</script>
The above part copy and paste in your page head section
HTML:
<body>
<input type="text" onkeydown="return isAlphaNumeric(event.keyCode);" onkeyup="KeyUp(event.keyCode);" />
</body>
IN php it done as below
if(preg_match('/[^a-z_\-0-9]/i', $string))
{
echo "not valid string";
}
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