Re: [Pharo-users] how to use indexes to copy a substring out of a string

[Hernán Morales Durand via Pharo-users]

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Hi Roelof

You may have a look at my StringExtensions package at
https://github.com/hernanmd/StringExtensions
I wrote several algorithms for working with substrings like:

https://github.com/hernanmd/StringExtensions/blob/master/repository/StringExtensions.package/String.extension/instance/indexesOfMotif..st
https://github.com/hernanmd/StringExtensions/blob/master/repository/StringExtensions.package/String.extension/instance/indicesOfSubstringOverlaps..st

Some of them used in https://github.com/hernanmd/BioSmalltalk where
you can find also algorithms for k-mer counting and clump finding:

https://github.com/hernanmd/BioSmalltalk/blob/master/repository/BioTools.package/BioSequence.class/instance/clumpFindK.length.times..st
https://github.com/hernanmd/BioSmalltalk/blob/master/repository/BioTools.package/BioSequence.class/instance/kmersCount.mismatches..st

for the Bio repo just consider a Sequence like a more advanced String.

Cheers,

Hernán

El sáb., 29 dic. 2018 a las 13:29, Roelof Wobben (<r.wob...@home.nl>) escribió:
>
> Hello,
>
> Still working on AdventOfCode
>
> Im struggeling to see how this can be solved.
>
> Now, a nice string is one with all of the following properties:
>
> It contains a pair of any two letters that appears at least twice in the 
> string without overlapping, like xyxy (xy) or aabcdefgaa (aa), but not like 
> aaa (aa, but it overlaps).
> It contains at least one letter which repeats with exactly one letter between 
> them, like xyx, abcdefeghi (efe), or even aaa.
>
> my game plan was this
>
> 1) group the characters and filter everything out which has a count not equal 
> to two
>
> 2) find the indexes of the characters and with the indexes use a copy method 
> so I have a substring out of it
>
> 3) do the same with the substring so again 1 and 2
>
> but how can I make 2 work.
>
> Roelof
>
>

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