Use regexp to find all letters in string except one

Question

Assen Koev 2024-1-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2073976-use-regexp-to-find-all-letters-in-string-except-one

评论： Stephen23 2024-1-24

采纳的回答： Sulaymon Eshkabilov

Is it possible to build a regexp search expression with an "intersection" of the default sets?

Simple conceptual example is the following:

Suppose I have a char 'abcd1 23 ,.@_'. (the char can include ANY character, not just the example ones)

I would like to return all LETTERS only except for 'd'.

In other words I need the search expression EXPR to be "\w except for d" or an intersection of \w and [^d]

Code example:

inputText = 'abcd1 23 ,.@_';

EXPR = ?

result = regexp(inputText,EXPR,'match')

{'a'} {'b'} {'c'}

Thank you

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Assen Koev 2024-1-24

编辑：Assen Koev 2024-1-24

Thanks Stephen

thanks for the correction I should have used a-zA-Z instead of \w

So, just to confirm that "You would have to list..." means constructions like the one in the link here is not possible?

Java Regex include all letters of the alphabet except certain letters - Stack Overflow

I mean the format "[A-Z&&[^IVX]]+"?

Stephen23 2024-1-24

"constructions like the one in the link here is not possible?"

There are no such constructions shown in the MATLAB documentation:

https://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html

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Answer 1

Sulaymon Eshkabilov 2024-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/2073976-use-regexp-to-find-all-letters-in-string-except-one#answer_1396826

在 MATLAB Online 中打开

This how it can be done:

inputText = 'abcd1 23 ,.@_';
EXPR = '[a-cA-Ce-zA-Z]';
result = regexp(inputText, EXPR, 'match');
disp(result);
    {'a'}    {'b'}    {'c'}

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Answer 2

Anton Kogios 2024-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2073976-use-regexp-to-find-all-letters-in-string-except-one#answer_1396831

编辑：Anton Kogios 2024-1-24

在 MATLAB Online 中打开

I copied your question (with no edits) into the MATLAB AI Chat Playground, and this was the response:

Yes, it is possible to build a regexp search expression with an "intersection" of the default sets in MATLAB. To return all letters except for 'd', you can use the following expression:

inputText = 'abcd1 23 ,.@_';
EXPR = '[a-ce-zA-Z]';
result = regexp(inputText, EXPR, 'match')
result = 1×3 cell array
    {'a'}    {'b'}    {'c'}

The expression `[a-ce-zA-Z]` matches any letter from 'a' to 'c' and from 'e' to 'z' (both lowercase and uppercase). The result will be a cell array containing the matched letters: `{'a', 'b', 'c'}`.

I think that there is a small error in that EXPR should be '[a-ce-zA-CE-Z]' to get both lowercase and uppercase if you want it. I would also note that using \w as you mentioned would also include numbers (not just letters).

Hope this helps!

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Use regexp to find all letters in string except one

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Use regexp to find all letters in string except one

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