Writing a "not" snort rule

[ntbuck12 () yahoo com]

Attention Joe and snort rule writers. I have read a fair amount of information on writing rules, but now I am stuck on 
how to to this.

How could I detect on the following scenario? - Alert on any packet that contains ANYTHING OTHER THAN "message1", 
"message2" or "message3", in a certain field.

Obviously I could use offset and depth to narrow down to the field I'm looking at, but now to a do a "negative search". 
Ideas?


Side Note: I'm pretty sure whatever Joe Esler gets paid isn't nearly enough. I love the blogs too, Joe.

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