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10 digit validation in jquery

$("#phone_num").on("blur", function(){
	var mobNum = $(this).val();
	var filter = /^d*(?:.d{1,2})?$/;
	if (filter.test(mobNum)) {
      if(mobNum.length==10){
        alert('Propper Value.');
      } else {
        alert('Please put 10  digit phone number');
        return false;
      }
	} else {
      alert('Not a valid number');
      return false;
    }    
  });