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I my form input box I want to allow only letters, numbers and underscore using jQuery. I need help.
This example code is allow only letters, numbers and (“_”) in a input box.
<script type="text/javascript"> var pen=$('#pen').val(); var re = /^w+$/; if (!re.test(pen)) { $('#PenErr').text('*Only letters, numbers and _ to be allowed in Pen Name..'); $('#pen').focus(); return false; } </script>