Not doesn’t work like that. The way you are working with Not is similar to a workflow one might use with selecting columns, not rows.
You want occursin
julia> filter(:Sites => t -> occursin(r"N", t) == false, df)
Not doesn’t work like that. The way you are working with Not is similar to a workflow one might use with selecting columns, not rows.
You want occursin
julia> filter(:Sites => t -> occursin(r"N", t) == false, df)