Trying to find a way to delete cookie with a domain name using irule

rajb I believe the following iRule would work for you but please keep in mind that when you compare "GuysOnlineFilter" text it must be that exact text string, so It has to have those capitalized letters otherwise it will not match and it will do nothing. I recommend testing this in a lab evironment or on a test virtual server to ensure it is working as expected before applying to a production virtual server.

when HTTP_REQUEST priority 500 {
  
    foreach a_cookie [HTTP::cookie names] {
        
        set CookieDomain [HTTP::cookie domain ${a_cookie}]

        if { ${a_cookie} == "GuysOnlineFilter" } {

            if { [HTTP::cookie domain ${CookieDomain}] contains ".sq.org" } {
                log local0. "it's working"
                HTTP::cookie remove ${a_cookie}
            }
                       
        }

    }

}