Showing valid characters from a validator mask

[Dimitris Mouchritsas]

Hi all,
I've got a form bean for a user which has a field username (duuhhh:)
We use a mask of  ^[a-zA-Z_0-9-]*$. Is there a way I can show the
valid characters to the user? Currently the error message in
ApplicationResources properties is:

errors.invalid={0} is invalid.

and the xdoclet tags are :

   /**
    * @struts.validator type="required,mask,maxlength"
    *
    * @struts.validator-var name="maxlength" value="20"
    * @struts.validator-var name="mask" value="^[a-zA-Z_0-9-]*$"
    *
    * @struts.validator-args arg0resource="validator.reg.username"
    * @struts.validator-args arg1value="${var:maxlength}"
    * @struts.validator-args arg2value="${var:mask}"
    *
    * @param username The username to set.
    */
   public void setUsername(String username) {
           this.username = username;
   }

What I am fearing is if I write
errors.invalid={0} is invalid. Valid characters are {2}
all invalid validation messages will be like that.

Thanks.

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