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Use regexp to find all letters in string except one

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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
  3 Comments
Assen Koev
Assen Koev on 24 Jan 2024
Edited: Assen Koev on 24 Jan 2024
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?
I mean the format "[A-Z&&[^IVX]]+"?
Stephen23
Stephen23 on 24 Jan 2024
"constructions like the one in the link here is not possible?"
There are no such constructions shown in the MATLAB documentation:

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Answers (2)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 24 Jan 2024
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'}

Anton Kogios
Anton Kogios on 24 Jan 2024
Edited: Anton Kogios on 24 Jan 2024
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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