Match empty OR missing

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Newsgroups gmane.comp.apache.mod-security.user
Message-ID <20200105184921.Horde.ntLtxZcMtUfTEfMJ_Xt4xOX@webmail.inetadmin.eu> 
Hi,

can someone advice me how to match a POST parameter, which must be  
'empty OR missing' with one exclusive rule? i.e. it's either  
completely not there or is like 'parameter='. Thanks.

azur




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