Alphanumeric Expression

[meiko]

I need to verify that user are entering 9 alpha-numeric characters.....no more...no less. Could someone tell me what the correct expression is for that?

Thanks!

[adonis1976]

<script type="text/javascript">
function isok(string) {
if (string.search(/\w{9,9}/) != -1)
return true;
else
return false;
}
function validator(form) {
if (isokl(form.field_name.value) == false) {
alert("Please enter a string.");
form.field_name.focus();
return false;
}
</script>

and call the validator function onSubmit in the form definition as follows:

onSubmit="return validator(this);"