How to read all lines in txt file satisfying some condition

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Mateusz 2013-10-22

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编辑： Cedric 2013-10-22

Let's assume we have the following format in the file: 1 str1 0 str2 1 str3 ...

that is in each line we have: the first character is number, either 0 or 1, next a whitespace (space or tab) and next a string.

I would like to get all strings that have 1 as first characted in the line. How to do this efficiently (and elegantly, preferably with one-liner). I know I can use fgets and just iterate over the lines.

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Answer 1

Cedric 2013-10-22

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编辑：Cedric 2013-10-22

在 MATLAB Online 中打开

The following is assuming that you have one pair number/string per line in the file.

match = regexp( fileread('myFile.txt'), '(?<=1 )[^\r\n]+', 'match' ) ;

but one-liner doesn't mean efficient or elegant. You would have to compare this regexp-based approach to approaches based on FGETL, FSCANF, or TEXTSCAN ..