code: function WS(min_len, max_len) {
          if (typeof min_len === "undefined") { min_len = 1; }
          if (typeof max_len === "undefined") { max_len = Number.MAX_VALUE; }
          return _make_alias('WS', paka.P.WS, REPEAT(IN([' ', '\t', '\n', '\n'].join('')), min_len, max_len));
      }
docs: Whitespace: matches white spaces, example: ' ', '\t'