# from the KNOWN_REGEXPS constant (by default)
    def get_meta_value(path, regexp, kregexp = KNOWN_REGEXPS)
        result = nil

        txt = retrieve_content(path)
        if txt
            kregexp[regexp].each do |rp|
              mvalue = txt.scan(rp).flatten[0]
              if mvalue
                result = { :str => mvalue, :buf => txt }
              end
            end
        end

        return result
    end