正则验证输入汉字和英文字母

<script type="text/javascript">
  $('#yanzheng').click(function() {
    var nicename = $('.nicename').val();
    var regu = "^[a-zA-Z\u4e00-\u9fa5]+$";
    var re = new RegExp(regu);
    if (re.test(nicename)) {
      return true;
    }else{
      alert('姓名必须为汉字或字母');
      return false;
    }
  });
</script>