How to read a text file and only keep certain numbers?

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cherrymath78
cherrymath78 2016-5-2
编辑： Robert 2016-5-4
Hi,
I have a text file which contains the information listed below: (similar format)
-------------------------------
Info1.txt
Number: 01
Graduation Year: 2005
Class: 1268
Age: 32
Info2.txt
Number: 02
Graduation Year: 2006
Class: 8640
Age: 31
Info3.txt
Number: 03
Graduation Year: 2005
Class: 5309
Age: 32
Info4.txt
Number: 04
Graduation Year: 2005
Class: 2954
Age: 32
----------------------------
I’m trying to write a Matlab code that reads this .txt file and gives me only the class numbers as a list:
1268
8640
5309
2954
Thanks a lot!
  1 个评论
Stephen23
Stephen23 2016-5-2
编辑：Stephen23 2016-5-2
@cherrymath78: please edit your question and upload a copy of the file using the paperclip button.
You should change the names if they should not be released publicly.

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回答（1 个）

Robert
Robert 2016-5-2
编辑：Robert 2016-5-4
Once you have the data in MATLAB ( fileread will do the trick) you can use regular expressions to find your data. Use MATLAB's regexp to search for consecutive digits that follow the string "Class: ".
str = fileread(fid); % Fixed based on comment below. Thanks, Walter!
classNums = regexp(str,'(?<=Class: )\d+','match')
classNums = str2double(classNums)

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