Wireshark filter "contains" question

[George Vandelet <george_vandelet () yahoo com>]

I have rececently found the "contains" filter in wireshark which is VERY 
powerful.  For instance, if I only want to see http packets that contain the 
string "SOAP" I could used the filter "http contains SOAP".  However, if I wish 
to use the filter to show http packts that DONT contain the string SOAP, I can 
not do it!  I have tried using the following without success.
 http contains !(SOAP)
 http contains !SOAP
 http !contains SOAP 
 
 Does anyone know a way to  negate the "contains" filter?
 
 Thanks,
 
 George


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