(RADIATOR) RewriteUsername

[Kon Georgopoulos (Alphawest)]

We have an issue wherer users can type in for example user1 at realm2@realm1 and be allowed to authenicated into the realm1 with the ser1 from realm2's account.
 
Would the best approach to this be to make use of RewriteUsername to correcltty format? I could strip out the first name before the first @ and user the realm after the last @.
 
So are there any regular expression GURUs?
 
Kon,
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