Exporting matched lines from a text file
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I am trying to export the lines in a text file that contain '~' in column 8 to another text file. I have written the code below:
content = fileread('mwithrm21.txt');
linestocopy = regexp(content, '^([^|]*\|){8}~\.*$', 'match', 'dotexceptnewline', 'lineanchors');
newfile = fopen('LFunclassified.txt', 'wt');
fprintf(newfile, strjoin(linestocopy, '\n'));
fclose(newfile);
I don't understand why it is returning a blank file as the export. Most likely a problem in the linestocopy command, but I don't know what else to modify. My file is also attached.
采纳的回答
Because your file contains no new line characters (\n = ASCII 10) but only carriage return characters (\r = ASCII 13). After you read the file, convert \r to \n for testing:
content = fileread( 'mwithrm21.txt' ) ;
content(content==13) = 10 ;
Then you should work on the code that produces the txt file if you can, and use \n. Finally, as Per mentions, you have 8 columns so you have max 7 separators.
Finally, you may be able to simplify your pattern, for something like
'^(.*?\|){7}~.*$'
but you'll have to test it.
2 个评论
jgillis16
2015-8-12
The code that you wrote under Per solution should work if you modify the number of columns appropriately and the call to STRSPLIT with '\r'.
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