wilcard usage with strncmp

2021 5 16
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更新时间：2021 5 16
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I have a cell array data (C). I use the following code to find specific character in the C;
find_character = strncmp(C, '* 2020', 7);
How can I use wilcard using strncmp to find all patterns satisfy * [0-9][0-9][0-9][0-9]? For example, if * 1988 or * 2000 exist in C, they can be also extracted.

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Stephen23
Stephen23 2021-5-16
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Ran in:
C = {'hello','* 2020','world','* 1923'};
X = ~cellfun(@isempty,regexp(C,'^\* \d{4}$'))
X = 1×4 logical array
0 1 0 1
D = C(X)
D = 1×2 cell array
{'* 2020'} {'* 1923'}

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Adam Danz
Adam Danz 2021-5-16
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Ran in:
Or, if * is a wild card to ignore any preceeding characters,
C = {'adfa 2000', 'xfga 1999', 't 2020', '1000', 'adfadre 12'};
X = ~cellfun(@isempty,regexp(C,'\d{4}','match','once'))
X = 1×5 logical array
1 1 1 1 0
matches = regexp(C,'\d{4}','match','once')
matches = 1×5 cell array
{'2000'} {'1999'} {'2020'} {'1000'} {0×0 char}
sermet OGUTCU
sermet OGUTCU 2021-5-16
编辑：sermet OGUTCU 2021-5-16
My cell array includes multiple characters in one cell such as; {'* 2021 3 28 …'} ('* 2021 3 28 0 0 0.00000000'). Therefore, the above regexp cannot find the * [0-9][0-9][0-9][0-9] and it produce the empty D. How I can modify the above codes to work consistently with my cell array.
Stephen23
Stephen23 2021-5-16
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"How I can modify the above codes to work consistently with my cell array."
Remove the '$' from the end of the regular expression:
C = {'hello','* 2020 3 28','world','* 1923'};
X = ~cellfun(@isempty,regexp(C,'^\* \d{4}'))
X = 1×4 logical array
0 1 0 1
sermet OGUTCU
sermet OGUTCU 2021-5-16
Thank you very much Stephen.

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Image Analyst
Image Analyst 2021-5-16

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Use the pattern functionality. I think it's easier than regexp().
>> doc pattern

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