why F5 give me this error

Hi,

You are using end_with but the correct syntax is ends_with :

when CLIENT_ACCEPTED { 
    set allowed 0 
    if { [class match -- [whereis [IP::client_addr] country] equals "EG"] or [[whereis [IP::client_addr] country ] not equals "EG"] } { 
        set allowed 1 
    } 
} 
when HTTP_REQUEST { 
    if { ($allowed == 0) and ([HTTP::uri] ends_with "/register") } { 
        HTTP::respond 403 content "Blocked!"
    } 
}