A problem while splitting a text input with regexp

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Samyukta Ramnath 2013-8-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84761-a-problem-while-splitting-a-text-input-with-regexp

I have a text file with the input as

sammy yo yo
yoyo with you
Samyukta

and I tried the following code to put each word into an element of an array.

fid = fopen('test4.txt');
table = fscanf(fid,'%c');
table2 = regexp(table,'\n','split');

this means that when I refer to table2{1}, it returns 'sammy yo yo' then I split every line individually with strsplit and ' ' (whitespace) as the delimiter. Therefore, when I refer to table2{1}{2} , it returns 'ýo'. But, the last word of every line has more number of letters than appears i.e. size(table2{1}{2},2) = 3 rather than 2. But when I strcmp it with '\n' and ' ' or any other thing, it returns 0. So now I don't know what to do.

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Walter Roberson 2013-8-15

在 MATLAB Online 中打开

What shows up for

table2{1}{2}(end) + 0

I suspect you will find it is 13 (carriage return)

Samyukta Ramnath 2013-8-15

it gives an error : cell contents reference from a non cell array object

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Answer 1

Cedric 2013-8-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84761-a-problem-while-splitting-a-text-input-with-regexp#answer_94323

在 MATLAB Online 中打开

 >> fprintf('%d,', table) ;  fprintf('\n') ;
 115,97,109,109,121,32,121,111,32,121,111,13,10,121,111,121,111,32,119,105,
 116,104,32,121,111,117,13,10,83,97,109,121,117,107,116,97,13,10,

As you can see, at the end of each line, there are 13 (carriage return: '\r') and 10 (new line: '\n').

If you just want to split words, why don't you split using REGEXP only with a pattern which matches whitespaces? For example:

 >> buffer = fileread('test4.txt') ;
 >> words  = regexp(buffer, '\s+', 'split')
 words = 
    'sammy'    'yo'    'yo'    'yoyo'    'with'    'you'    'Samyukta'    ''

with this, you would just have to delete the last cell when empty (which happens when your file ends with '\r\n'), and you would be done.

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Walter Roberson 2013-8-15

Only if the file was created with an older MS Windows editor. More modern MS Windows editors only put in \n (newline) without \r (carriage return). Linux and OS-X have never used \r . (MacOS before OS-X might have used \r )