How to restrict input string in length,symbols, char and numbers

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Johnny Birch 2020-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/509627-how-to-restrict-input-string-in-length-symbols-char-and-numbers

评论： Johnny Birch 2020-3-7

I am developing an app where the user inputs a string which need several restrictions. How can I check that the input is in the format 'LLL-NN-NNN' where L is lettes (A-Z) and N is numbers (0-9), and the string have to be exactly 10 characters in total.

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Answer 1

Stephen23 2020-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/509627-how-to-restrict-input-string-in-length-symbols-char-and-numbers#answer_419043

编辑：Stephen23 2020-3-7

在 MATLAB Online 中打开

>> str = 'XYZ-99-123'; % okay
>> ~isempty(regexp(str,'^[A-Z]{3}-\d{2}-\d{3}$','once'))
ans = 1
>> str = 'XYZ-99-ABC'; % not okay
>> ~isempty(regexp(str,'^[A-Z]{3}-\d{2}-\d{3}$','once'))
ans = 0
>> str = '666-99-123'; % not okay
>> ~isempty(regexp(str,'^[A-Z]{3}-\d{2}-\d{3}$','once'))
ans = 0
>> str = 'hello world'; % not okay
>> ~isempty(regexp(str,'^[A-Z]{3}-\d{2}-\d{3}$','once'))
ans = 0