How can I determine whether a string contains a substring?

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MathWorks Support Team 2017-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/345593-how-can-i-determine-whether-a-string-contains-a-substring

编辑： MathWorks Support Team 2022-11-29

I have directory names that end in '0.0100'. I want to be able to skip certain directories by comparing the substring '0.0100' to the directory name. How can I do this?

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Answer 1

MathWorks Support Team 2022-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/345593-how-can-i-determine-whether-a-string-contains-a-substring#answer_271357

编辑：MathWorks Support Team 2022-11-17

在 MATLAB Online 中打开

You can use the 'contains' function to determine whether a string contains a given substring or not. Specifically, 'contains' returns true if the first argument contains the second argument and false otherwise. For example:

>> smallSubstring = '0.0100';
>> largeString1 = 'Item0.0100';
>> largeString2 = 'Item0.0101';
>> contains(largeString1, smallSubstring)
ans =
  logical
   1
>> contains(largeString2, smallSubstring)
ans =
  logical
   0

You may find more information about 'contains' at the following documentation page:

https://www.mathworks.com/help/matlab/ref/string.contains.html

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Steven Lord 2022-11-17

在 MATLAB Online 中打开

If you only want to detect a substring at the end of the larger string, use endsWith instead of contains. The corresponding function for detecting substrings at the beginning is startsWith.

A = ["MATLAB", "laboratory", "collaboration"];
startsWith(A, "lab")
ans = 1×3 logical array
   0   1   0
endsWith(A, "lab", 'IgnoreCase', true) % LAB is close enough to lab
ans = 1×3 logical array
   1   0   0
contains(A, "lab")
ans = 1×3 logical array
   0   1   1