Allow all MAC address

[Pascal Legrand]

Hello,
I use freeradius to limit the access to our network by filtering MAC 
address:
XXXXXXXXXXXX Cleartext-Password := "XXXXXXXXXXXX", Machine-Name := 
"COMPUTER_1"

When we receive new computers, we use the FOG software to deploy a clean 
image on all new computers.
The problem is that we have not yet set up Freeradius to allow these 
news computers to access our network.
My question is the following: is it possible to authorize punctually all 
MAC addresses to access the network while we recover them to configure 
Freeradius?

The idea would be to add a line like :
ALL_MAC_ADDRESS Cleartext-Password := "ALL_MAC_ADDRESS", Machine-Name := 
"NEW_MACHINE"
Does Freeradius allow regular expressions in its configuration file?
If yes, what should be the form of this regular expression?

Thank you in advance for your help.

Pascal