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 2025-1-28

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 2025-1-28

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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 2025-1-28

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" function 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

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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