Find multiple strings within another string

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Daniel Eidsvåg
Daniel Eidsvåg 2017-4-20
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
Stephen23 2017-4-20
编辑：Stephen23 2017-4-20
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
Stephen23 2017-4-21
编辑：Stephen23 2017-4-21
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]
[]
Daniel Eidsvåg
Daniel Eidsvåg 2017-4-21
Thank you very much! It now works as intended =)

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更多回答（1 个）

Tao Wang
Tao Wang 2022-1-13
mystr={'123a1','ab','111'};
pat = ("a"|"b");
a = strfind(mystr,pat)
% can get index of each match
ab = contains(mystr,pat)
% logical result

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