Sort array of strings after criteria in the middle of each string

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Pascal Viertel 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715815-sort-array-of-strings-after-criteria-in-the-middle-of-each-string

回答： Voss 2022-5-10

采纳的回答： Voss

Hello community,

i have an array of strings of different lengths which i want to sort.

The arrray could look like this:

str = ["xer_cQwe" "po_bLo" "te_aUc"].

I want to sort the array in an alphabetical order regarding the criteria "_x". In each variable theres only one underline "_" and i want to sort it alphabetically for the then following letter.

Thanks in advance.

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langrg 2022-5-10

在 MATLAB Online 中打开

Hi,

There is certainly a better solution, but it should work:

str = ["xer_cQwe" "po_bLo" "te_aUc"];
match = regexp(str, '_\w+', 'match');
[~, idxSort] = sort([match{:}]);
strSorted = str(idxSort);

dpb 2022-5-10

编辑：dpb 2022-5-10

It's a pain can't return second argument from sort for such cases; I've asked it to be an enhancement that I think made the list to be considered, anyway. I built a local utility function that is a wrapper that does that for personal use.

Alternative also is the new(ish) pattern facility that lets one right search expressions w/o explicitly using regexp. It probably is no faster and may be slower...I've used it only a couple times so have to go research how to write something for given purpose.

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Answer 1

Voss 2022-5-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1715815-sort-array-of-strings-after-criteria-in-the-middle-of-each-string#answer_961470

在 MATLAB Online 中打开

str = ["xer_cQwe" "po_bLo" "te_aUc"];
[~,idx] = sort(extractAfter(lower(str),'_'));
sorted_str = str(idx)
sorted_str = 1×3 string array
    "te_aUc"    "po_bLo"    "xer_cQwe"