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https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#answer_16100

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#comment_686175

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#comment_686181

Working with a string array is different than working with a char array. What Walter wrote is true for char arrays (which was the main data type for storing text data in 2011, as the string class didn't exist yet.)

      
        button =
       
        "button"
       
        ;
       
        str =
       
        'abcde'
       
        ;
       
        if
       
        contains(str, button)
       
        disp(
       
        "["
       
        + str +
       
        "] contains the string ["
       
        + button +
       
        "]"
       
        )
       
        else
       
        disp(
       
        "["
       
        + str +
       
        "] doesn't contain the string ["
       
        + button +
       
        "]"
       
        )
       
        end

Now change the contents of the str variable and perform the same comparison.

      
        str =
       
        'space button'
       
        ;
       
        if
       
        contains(str, button)
       
        disp(
       
        "["
       
        + str +
       
        "] contains the string ["
       
        + button +
       
        "]"
       
        )
       
        else
       
        disp(
       
        "["
       
        + str +
       
        "] doesn't contain the string ["
       
        + button +
       
        "]"
       
        )
       
        end

The contains function can accept two char vectors, two string arrays, two cell arrays containing char vectors, or a combination of those three types.

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#answer_16099

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#comment_25951

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#comment_25977

https://www.fr.mathworks.com/matlabcentral/answers/11782-using-string-in-if-statement#answer_819218

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