First of all, I know replace or plugging input of given function through command Replace[] or /.{x->1} etc.

Here I want to focus not just on plugging or replacing variables into numbers but just replacing some of the variable's names or deleting unnecessary operations to another.

First of all suppose I have sequences aa1,aa2,aa3,aa4, bb1,bb2,bb3,bb4, cc1,cc2,cc3,cc4, etc. and I have a function whose expression is some combination of particular sequences.

I want to replace the name of all my sequences i.e., aa1-> ab1, cc1-> cb1, etc

So for a given input $aa1bb1+aa2cc1$, after this replacement, this produces $ab1bb1+ ab2cb1$.

Using some editor like notepad, I can do this by find and research easily but have wonder whether a similar thing can do on Mathematica itself.

  • 2
    $\begingroup$ Storing information in the variable's name instead of in its contents seems like a bad idea to me. $\endgroup$
    – Roman
    Commented Jul 23, 2021 at 14:06
  • 1
    $\begingroup$ Are you looking for an IDE that can rename all variables in a program file for you? (E.g. plugins.jetbrains.com/plugin/7232-wolfram-language) $\endgroup$
    – Michael E2
    Commented Jul 23, 2021 at 15:11

2 Answers 2


If you are trying to do replacement in the front end, you can try something like

ac = Cells[CellStyle -> {"Input"}];
content = NotebookRead /@ ac;
newContent = content /. {"aa1" -> "ab1", "cc1" -> "cb1"};
Scan[NotebookWrite[ac[[#]], newContent[[#]]] &, Range@Length@newContent];

enter image description here


rules = {aa1 -> ab1, aa2 -> ab2, cc1 -> cb1};

convert[x_] := ToExpression@StringJoin[
    Map[ToString, rules, {2}]]]

expr = aa1bb1 + aa2cc1;


(* ab1bb1 + ab2cb1 *)

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