# File lib/ruote/exp/ro_variables.rb, line 167
    def split_prefix (var, prefix)

      if prefix.nil?
        var = var.to_s
        m = VAR_PREFIX_REGEX.match(var)
        prefix = m ? m[1][0, 2] : ''
        var = var[prefix.length..-1]
      end

      [ var, prefix ]
    end