Find multiple strings within another string

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Daniel Eidsvåg 2017-4-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/336309-find-multiple-strings-within-another-string

回答： Tao Wang 2022-1-13

I am trying to find the indexes in a struct 'data.orig_reg' where the corresponding strings I am trying to find is 'a_13'. The following code works just fine.

CVT_PAT = find(~cellfun('isempty',strfind({data.orig_reg},'a_13')))'; 
[sharedCVTVals,~] = intersect(CVT,CVT_PAT);

If I implement multiple string searches such as:

TEST = {'a_13','a_14','a_164'}.
CVT_PAT = find(~cellfun('isempty',strfind({data.orig_reg},TEST)))'; 
[sharedCVTVals,~] = intersect(CVT,CVT_PAT);

This returns an error:

Error using strfind

PATTERN must be a string scalar or character vector.

This is due to strfind only takes in one string at the time as faar as I can tell... Is there a way to make this code work by using multiple strings as an input like the variable TEST described above?

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采纳的回答

Stephen23 2017-4-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/336309-find-multiple-strings-within-another-string#answer_263767

编辑：Stephen23 2017-4-20

在 MATLAB Online 中打开

One solution: wrap it all up in another cellfun:

>> C = {'A','B','xxxa_13x','xxa_14x','C','a_13'};
>> TEST = {'a_13','a_14','a_164'};
>> out = cellfun(@(s)find(~cellfun('isempty',strfind(C,s))),TEST,'uni',0);
>> out{:}
ans =
   3   6
ans =  4
ans = []

Note that you did not specify how you want the output: do you want to be able to distinguish which string was matched, or which pattern was matched, or both, or neither (e.g. a simple count of how many matches were made). Each of these could be coded differently.

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Stephen23 2017-4-21

编辑：Stephen23 2017-4-21

在 MATLAB Online 中打开

Then we should use strcmp instead of strfind:

>> C = {'a_2','a_3','a_4','a_14','a_20','a_21', 'a_22'};
>> TEST = {'a_2','a_20','a_164'};
>> cellfun(@(s)find(strcmp(s,C)),TEST,'uni',0)
ans =
    [1]
    [5]
    []