regexp shows an error while reading a space in text file.

Question

Aakriti Srivastava 2022-7-25

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1767335-regexp-shows-an-error-while-reading-a-space-in-text-file

编辑： Aakriti Srivastava 2022-7-25

采纳的回答： VBBV

This is the section that I want to read using regexp from port 12 to port 22 as

PORT 23 P=1 Z=50

PORT 12 P=2 Z=50 PIN_ID=CB7TX

PORT 13 P=3 Z=50 PIN_ID=CB7RX

PORT 14 P=4 Z=50 PIN_ID=CB66TX

PORT 15 P=5 Z=50 PIN_ID=CB25TX

PORT 16 P=6 Z=50 PIN_ID=CB25RX

PORT 22 P=7 Z=50 PIN_ID=CB66RX

This is the code I am using

[port_tokens2,port_match3] = regexp(data,'PORT\s+(\d+)\s+(\w+=\d)+\s+\w+=\d+\s','tokens','match')

Result I got

port_match3 =

1×7 cell array

Columns 1 through 5

{'PORT 23 P=1 Z=5…'} {'PORT 12 P=2 Z=50 '} {'PORT 13 P=3 Z=50 '} {'PORT 14 P=4 Z=50 '} {'PORT 15 P=5 Z=50 '}

Columns 6 through 7

{'PORT 16 P=6 Z=50 '} {'PORT 22 P=7 Z=50 '}

But I want to read PIN_ID = CBXXXX also so I used this expression

[port_tokens2,port_match3] = regexp(data,'PORT\s+(\d+)\s+(\w+=\d)+\s+\w+=\d+\s\w+=w+','tokens','match')

This is the result I got

port_match3 =

0×0 empty cell array

Would anyone please let me know what is wrong with my expression that I am not able to read the whole sentence.

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Aakriti Srivastava 2022-7-25

Hi yaah I tried with that one also but it didnt work i.e. the additional space but it didnt work any other probability or erorr in my expression u can think of because I tried all possible way to read them out but no success and I really need to read this. Thanks

Walter Roberson 2022-7-25

I would debug by extending one bit at a time to see exactly where it is breaking

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Answer 1

VBBV 2022-7-25

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1767335-regexp-shows-an-error-while-reading-a-space-in-text-file#answer_1014645

在 MATLAB Online 中打开

ss = 'PORT 12 P=2 Z=50 PIN_ID=CB7TX'
[port_tokens2,port_match3] = regexp(ss,'PORT\s+(\d+)\s+(\w+=\d)+\s+\w+=\d+\s+(\w*=\w*)','tokens','match')

You can try this

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Aakriti Srivastava 2022-7-25

hey VBBV !

Thanks alot :)

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Answer 2

Jakob Hölzl 2022-7-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1767335-regexp-shows-an-error-while-reading-a-space-in-text-file#answer_1014640

Hi,

regex101.com is a good website for such cases.

When I checked it there, the problem seemed to be that the last w+ should be \w+ to match the value of the PIN_IDs

Kind regards,

Jakob

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Aakriti Srivastava 2022-7-25

编辑：Aakriti Srivastava 2022-7-25

Hi

Jakob I really appreciate this debugging platform thanks for info.

Jakob Hölzl 2022-7-25

you're welcome!

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