Extract regexp tokens with regexpPattern

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Jan Kappen 2024-2-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2088731-extract-regexp-tokens-with-regexppattern

评论： Jan Kappen 2024-2-29

With regexp I could extract the tokens of my capture groups via

regexp("abcd3e", "\w+(\d)+\w", "tokens")
ans = 1×1 cell array
    {["3"]}

The result is a cell array. With the new regexpPattern and extract functions, the return values usually are string (arrays) which is something I prefer.

Question: Is there an analogon of the above regexp using something like extract("abcd3e", regexpPattern("\w+(\d)+\w"), "tokens")? This syntax obviously does not work in R2023b, but are there standard ways to rewrite these patterns to return my tokens?

Thanks,

Jan

EDIT: this is just a toy example, I do not only want to extract digits which could be done with digitsPattern. Ideally, I'd like to understand how directly translate the regexps.

To show a more realistic example:

str = [
    "42652Z_HEX"
    "42652X"
    "42652Y"
    "42652Z"
    "42652GYRO-X_HEX"
    "42652GYRO-Y_HEX"
    "42652GYRO-Z_HEX"
    "42351Temp_HEX"
    "42652Temp_HEX"
    "42652GYRO-X"
    "42652GYRO-Y"
    "42652GYRO-Z"
    "42351Temp"
    "42652Temp"
    ];
res = string(regexp(str, "\d+(?:GYRO-)?([XYZ])?.*", "tokens"))
res = 14×1 string array
    "Z"
    "X"
    "Y"
    "Z"
    "X"
    "Y"
    "Z"
    ""
    ""
    "X"
    "Y"
    "Z"
    ""
    ""
% how to get the same result with matches and regexpPattern?

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Dyuman Joshi 2024-2-29

移动：Dyuman Joshi 2024-2-29

在 MATLAB Online 中打开

If you just want to extract numbers between letters -

str = "abcd3e57xyz";
out = extract(str, digitsPattern)
out = 2×1 string array
    "3"
    "57"

Jan Kappen 2024-2-29

移动：Dyuman Joshi 2024-2-29

Thanks for your answer.

No, I do not only want to extract numbers, it's a toy example. I'd like to translate the regexps which already exist into the new regexpPattern - if possible. The regexp might get more complicated than the shown one. I'll edit my question accordingly.

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Answer 1

the cyclist 2024-2-29

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https://ww2.mathworks.cn/matlabcentral/answers/2088731-extract-regexp-tokens-with-regexppattern#answer_1419066

在 MATLAB Online 中打开

I realize that this is not really an answer to your question, but I just wanted to make sure you are aware that one option is to wrap the string function around the regexp:

string(regexp("abcd3e fghi4j", "\w+(\d)+\w", "tokens"))
ans = 1×2 string array
    "3"    "4"

Also, if you are guaranteed to have only one match, you could do

regexp("abcd3e", "\w+(\d)+\w", "tokens","once")
ans = "3"

but that's somewhat fragile coding, I would say.

I'm not yet sure if there is a more "direct" way with more recent functions.

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the cyclist 2024-2-29

Your updated question clarifies that my answer is not what you are looking for, but I'll leave it here anyway. :-)

Jan Kappen 2024-2-29

Thank you very much for your answer.

Yes, I updated the question to clarify a bit, sorry.

There were cases in the past where I could not cast to string, I'll need to check why. In fact that's not a terrible solution, but I'm simply wondering how to use the new regexpPattern properly and maybe I'm missing something.

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Extract regexp tokens with regexpPattern

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