Apache 2.4 web server - string manipulation

Applications Web Development
1

Hi,

I have configured an Apache 2.4 web server for Kerberos authentication. I need to pass the user in an HTTP header to the back-end server. This can be achieved by:-

# Set header to blank
RequestHeader set KERBEROS_USER ""
# Set header
RequestHeader set KERBEROS_USER "%{REMOTE_USER}s"

However the user is passed in the format:-
"userA@domain.com"

I would like to pass just "userA".

Please can anyone advise if this is possible and if so how?

Many thanks
Simon