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Re: match 1, replace 2


Trevor, Try this

ReplaceList[{{1, 2, 3}, {4, 5}, {6, 7, 8, 9}}, {___, x_List, ___} :>
Flatten[{
      ReplaceList[(Drop[x, -1] + 100), {___, y_Integer, ___} -> {
    y, -1}], Take[x, -1]}]]

{{101, -1, 102, -1, 3}, {104, -1, 5}, {106, -1, 107, -1, 108, -1, 9}}

Cheers,

Brian


Trevor Baca wrote:
> hi mathgroup,
>
> what rule takes
>
> ls = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}}
>
> to
>
>       {{101, -1, 102, -1, 3}, {104, -1, 5}, {106, -1, 107, -1, 108, -1,
> 9}}
>
> ie, matches all integers but the last in each list and then replaces
> each matched integer n with the 2-element sequence Sequence[100 + n,
> -1]?
> 
> trevor.


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