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I wonder how to replace specific element (even though repeated) within sublists of a nested list with multiple elements while maintaining the list structure. Suppose the following: 

{{{{O1, 2, 22, 24, 6, PoP1, 5, 23, 27, 17, PoP2, 18, 28, 14, D1}, {O1,
     1, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 13, D1}, {O1, 2,
     22, 24, 6, PoP1, 5, 23, 27, 17, PoP2, 18, 28, 14, 13, D1}, {O1, 
    2, 22, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 13, D1}, {O1,
     2, 1, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 13, D1}, {O1,
     1, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 13, 14, 
    D1}, {O1, 1, 21, 22, 24, 6, PoP1, 5, 23, 27, 17, PoP2, 18, 28, 14,
     D1}, {O1, 1, 2, 22, 24, 6, PoP1, 5, 23, 27, 17, PoP2, 18, 28, 14,
     D1}, {O1, 2, 22, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 
    13, 14, D1}, {O1, 2, 1, 21, 23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 
    27, 13, 14, D1}, {O1, 2, 1, 21, 22, 24, 6, PoP1, 5, 23, 27, 17, 
    PoP2, 18, 28, 14, D1}, {O1, 1, 21, 22, 24, 6, PoP1, 5, 23, 27, 17,
     PoP2, 18, 28, 14, 13, D1}, {O1, 1, 2, 22, 24, 6, PoP1, 5, 23, 27,
     17, PoP2, 18, 28, 14, 13, D1}, {O1, 1, 2, 22, 21, 23, 5, PoP1, 6,
     24, 28, 18, PoP2, 17, 27, 13, D1}, {O1, 2, 1, 21, 22, 24, 6, 
    PoP1, 5, 23, 27, 17, PoP2, 18, 28, 14, 13, D1}, {O1, 1, 2, 22, 21,
     23, 5, PoP1, 6, 24, 28, 18, PoP2, 17, 27, 13, 14, D1}}}}

I would like to substitute PoP1 with XXX,YYY,ZZZ and PoP2 with SSS,FFF while having the same list depth and sublists. I have tried with /. but it introduces a new sublist like : 

{{{{O1, 2, 22, 24, 6, {XXX, YYY, ZZZ}, 5, 23, 27, 17, {SSS, FFF},
     18, 28, 14, D1}, {O1,...
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  • $\begingroup$ Have a look at Sequence. $\endgroup$
    – b.gates.you.know.what
    Nov 8, 2018 at 16:39
  • $\begingroup$ You were right, just use sequence and is done. Thanks! $\endgroup$
    – Besi
    Nov 8, 2018 at 16:47

2 Answers 2

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Below is a minimal working example that you can adapt to your needs:

{{"x",1,3},{2,4,"z"}}/.{"x"->Sequence@@{"a","b"},"z"->Sequence@@{"c","d"}}

produces:

{{"a", "b", 1, 3}, {2, 4, "c", "d"}}

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making use of /. with element->Sequence[element1,element2] actually does it.

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