regexp to extract the last underscore and the following letter (last letter) from words

Question

Ioannis Vourvachakis 2021-11-15

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评论： Ioannis Vourvachakis 2021-11-15

采纳的回答： Mathieu NOE

I want to use regexp in order to extract only the last underscore and the last letter from the words below.

But if I have the words 'apple_c' and 'apple_man_man_h'

and I use regexp(words,'\_\w','split'),

then I get as a result 'apple' for both words, but it is wrong for me, because I want to extract onlythe last underscore and thr last letter, as I said.

The desired result for me is 'apple' and ''apple_man_man'.

How should i modify the command to achieve this?

Thank you

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Answer 1

Mathieu NOE 2021-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/1586974-regexp-to-extract-the-last-underscore-and-the-following-letter-last-letter-from-words#answer_831814

在 MATLAB Online 中打开

hello

I recognize I am not the regexp expert here , so I would suggest this alternative :

ind = findstr(words,'_');
word_out = words(1:ind(end)-1)

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Stephen23 2021-11-15

在 MATLAB Online 中打开

The behavior if there is no underscore might also be relevant:

words = 'apple';
ind = findstr(words,'_')
ind =

     []
word_out = words(1:ind(end)-1)
Array indices must be positive integers or logical values.

What is the desired output in this case?

Ioannis Vourvachakis 2021-11-15

Ηello Stephen, we talk about the case that all the words we study now contain an underscose and after the underscore follows the last letter of the word.

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