Identity does not match User-Name, setting from EAP Identity

Hi all, I have a username and identity in EAP attribute with pattern {m=1}xxxx@xxxx. I need to remove {m=1} for both username and identity in EAP attribute. I put some regular expression in default file authorize section to remove {m=1} for username and it works! But I have not found a way to remove {m=1} for identity in EAP packet. Any one can help? Thanks, Gina