Searching word list for key letters

Question

user86753 2022-1-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635330-searching-word-list-for-key-letters

评论： Walter Roberson 2022-1-24

wordList = {'apples'
    'orange'
    'banana'};
ContainList = 'shu';
NotContainList = 'br';

I'd like to be able to find all words that contain the letters S,H or U and do not have the letters B or R. I'm using 'contains' for each letter but is there a way to loop through the ContainList/NotContainList for each word?

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Answer 1

Walter Roberson 2022-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/1635330-searching-word-list-for-key-letters#answer_880975

编辑：Walter Roberson 2022-1-24

在 MATLAB Online 中打开

wordList = {'apples'
    'orange'
    'banana'};
ContainList = 'shu';
NotContainList = 'br';
mask1 = contains(wordList, num2cell(ContainList))
mask1 = 3×1 logical array
   1
   0
   0
mask2 = contains(wordList, num2cell(NotContainList))
mask2 = 3×1 logical array
   0
   1
   1
filtered_words = wordList(mask1 & ~mask2)
filtered_words = 1×1 cell array
    {'apples'}
%another approach
mask3 = ~cellfun(@isempty, regexp(wordList, "[" + ContainList + "]"))
mask3 = 3×1 logical array
   1
   0
   0
mask4 = ~cellfun(@isempty, regexp(wordList, "[" + NotContainList + "]"))
mask4 = 3×1 logical array
   0
   1
   1
filtered_words2  = wordList(mask3 & ~mask4)
filtered_words2 = 1×1 cell array
    {'apples'}
%another approach
pattern = "^[^" + NotContainList + ContainList + "]*[" + ContainList + "][^" + NotContainList + "]*$"
pattern = "^[^brshu]*[shu][^br]*$"
mask5 = ~cellfun(@isempty, regexp(wordList, pattern))
mask5 = 3×1 logical array
   1
   0
   0
filtered_words3 = wordList(mask5)
filtered_words3 = 1×1 cell array
    {'apples'}

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Walter Roberson 2022-1-24

在 MATLAB Online 中打开

In some cases you might want to work iteratively

wordList = {'apples'
    'orange'
    'banana'};
ContainList = 'shu';
NotContainList = 'br';
words_containing = wordList(contains(wordList, num2cell(ContainList)));
filtered_words = words_containing(~contains(wordList, num2cell(NotContainList)));

In situations where you are doing stepwise refinement, it is most efficient to start from the steps that are expected to make the most difference, each step discarding as much as practical, so that each step is searching less and less information.

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Answer 2

David Hill 2022-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635330-searching-word-list-for-key-letters#answer_880995

在 MATLAB Online 中打开

wordList = {'apples','orange','banana','show','unit'};
ContainList = 'shu';
NotContainList = 'br';
r=wordList(contains(wordList,num2cell(ContainList))&~contains(wordList,num2cell(NotContainList)));