Validate PanCard

#Validate the Pan Card field 

<!--Code snippets for validating PAN number.--> 

1) In HTML 5    
<input type="text" name="pan" id="pan" pattern="^([a-zA-Z]){5}([0-9]){4}([a-zA-Z]){1}?$">

2) In JavaScript
<input type="text" name="pan" id="pan"  onkeyup="return ValidatePan(this.value)">


<script>
function ValidatePan(pan){
var regpan = /^([a-zA-Z]){5}([0-9]){4}([a-zA-Z]){1}?$/;
 if(regpan.test(pan) == false)
 {
    alert("Permanent Account Number is not yet valid.");
    return false;
 }
 else
 {
    alert("You have entered a valid Permanent Account Number !"); 
    return true;
 }
}
</script>