Special Characters in a Text Variable

Yes. You can do it. but only for a multiline text field with Plain Text. 

1. Just assign control id your comment field as shown in below screen

2. Then add following script in custom javascript:

NWF.FormFiller.Events.RegisterAfterReady(function () {
              var ctrlComment = NWF$("#" + ctrlID_Comment);
              if(ctrlComment){
                  NWF$(ctrlComment).keypress(function (e) {
                     var regex = new RegExp("^[a-zA-Z0-9s]+$");
                     var str = String.fromCharCode(!e.charCode ? e.which : e.charCode);
                     if (regex.test(str)) {
                            return true;
                     }
                    e.preventDefault();
                   return false;
              });
           }
      });

I just allowed text and number. You can also change regular expression according to your requirement.

Let me know if you want sample form for this.

Hope it will help

Hi, thanks for the information. I think the characters that are causing the text not to show are [ and ]. Is there a listing of the characters that might cause the error in setting the variable other than these 2 characters? Also, is there a way to not allow these characters but allow all others (so I guess it would almost be the opposite of what you have)? Thanks again.