Character Restrictions in a Text File

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jgillis16 2015-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/249362-character-restrictions-in-a-text-file

评论： jgillis16 2015-10-19

observedsn.txt

I am trying to restrict the 25th column of this text file by exporting entire line either of the following characters, "Ib, Ib/c, Ic, IIb, II, IIP, IIn, IIPec". How would I go about doing this?

I have attached my text file as a reference.

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Answer 1

Walter Roberson 2015-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/249362-character-restrictions-in-a-text-file#answer_196440

在 MATLAB Online 中打开

contents = fileread('observedsn.txt');
[starts, stops] = regexp(contents, '^([^|]*\|){24}(Ib|Ib/c|Ic|II|IIP|IIn|IIPec)\|.*$', 'start', 'end', 'lineanchors', 'dotexceptnewline');

Now the relevant lines are at contents(starts(K):stops(K)) for K = 1 : length(starts)