Create function to extract data from .log file

2017 9 28
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更新时间：2017 9 28
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Dear all,
I want to write a function can extract data from log file. It like that
The number marked yellow is the number what I want to output and then used to do the calculate. I would really appreciate that if anyone can provide any help.
Thanks in advance.

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Walter Roberson
Walter Roberson 2017-9-28

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S = fileread('NameOfYourLogFileGoesHere.log');
value_of_interest_string = regexp('(?<=it\.it-nin\.icytot\.nrep2\.mtfail\.IMPES:\s*)\S+', 'match');
value_of_interest = str2double(value_of_interest_string);
This code does not assume that the value is an integer, just that it appears after the mtfail.IMPES: string and ends in whitespace.

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Cedric
Cedric 2017-9-28
编辑：Cedric 2017-9-28
It would probably work with the shorter pattern:
'(?<=IMPES:\s*)\S+'
Walter Roberson
Walter Roberson 2017-9-28
Probably Yes ;-) But just in case there is another IMPES: in the file...
Cedric
Cedric 2017-9-28
编辑：Cedric 2017-9-28
That's not IMPESsible! ;-)
haisheng yu
haisheng yu 2017-9-28
Thanks a lot. I just run this code return the NaN. I will take a look of the regexp function. Thanks again.
Cedric
Cedric 2017-9-28
编辑：Cedric 2017-9-28
There is a typo that I didn't spot: the first argument in the call to REGEXP should be the content to parse, which is variable S. Try with the following:
S = fileread('NameOfYourLogFileGoesHere.log');
value_of_interest_string = regexp(S, '(?<=it\.it-nin\.icytot\.nrep2\.mtfail\.IMPES:\s*)\S+', 'match');
value_of_interest = str2double(value_of_interest_string);
and/or with the simpler pattern that I proposed:
S = fileread('NameOfYourLogFileGoesHere.log');
value_of_interest_string = regexp(S, '(?<=IMPES:\s*)\S+', 'match');
value_of_interest = str2double(value_of_interest_string);
haisheng yu
haisheng yu 2017-9-28
Thanks a lot. It really help a lot. I also solved a way
Str = fileread('WH Generated path_09.log');
Key = 'it,it-nin,icytot,nrep2,mtfail,IMPES:';
Index = strfind(Str,Key);
Value =sscanf(Str(Index(1)+length(Key):end),'%g',1);
Walter Roberson
Walter Roberson 2017-9-28
Yes, sorry, I missed the S in the regexp call.

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