Sometimes, having all double brackets [[...]] transformed into \\[LeftDoubleBracket] ... \\[RightDoubleBracket] can really facilitate code reading.

On a given notebook, how to transform all occurrences automatically (on input cells)?

The other way around is easier, but a couple of buttons interface will get extra... thanks.

  • 2
    $\begingroup$ the lefts are easier :) $\endgroup$ Commented Oct 29, 2015 at 17:18
  • $\begingroup$ Cell>Convert To>StandardForm does this (it is what i use), but it also makes other changes that may not be desirable $\endgroup$ Commented Oct 29, 2015 at 22:37

1 Answer 1


Palette button

 Button["Compact Part",
       celldata = NotebookRead[cell],
       pattern = RuleDelayed[
         RowBox[{h__, "[", RowBox[{"[", spec___, "]"}], "]"}],
         RowBox[{h, "\[LeftDoubleBracket]", RowBox[{spec}], 
       Not @ FreeQ[celldata, First @ pattern],
       SelectionMove[cell, Cell, All, AutoScroll -> False];
         ReplaceRepeated[celldata, pattern], AutoScroll -> False
   {cell, Cells[InputNotebook[], CellStyle -> "Input"]}


It may happen that it will miss an example from time to time, it should be rare though. In heavily edited notebook I have faced box structures that were not "proper" but good enough for FrontEnd to understand. So it may happen this "proper" pattern won't catch them.

  • $\begingroup$ I tried it on ref/Part and it works. $\endgroup$
    – Kuba
    Commented Oct 29, 2015 at 18:44
  • $\begingroup$ Tried it on a 700 pages notebook, and, although it seems to work, the end message doesn't appear. When I have a little time, I will try to trace if it is the notebook size or some specific code content. $\endgroup$
    – P. Fonseca
    Commented Oct 31, 2015 at 20:49
  • $\begingroup$ @P.Fonseca it may be that's the size :) $\endgroup$
    – Kuba
    Commented Oct 31, 2015 at 20:50

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