- [^'']+
- [^>]+
- [\s\S]*
How should I fix my regular expression to parse this txt file?
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This is part of my code that reads the text file I attached and searches the file name between 'subsystems.tbl\' and '.sub' according to the given 'sub_sys (Major Role)' and 'location (Minor Role)' using regular expressions.
if ismember(sub_sys, {'spr', 'dpr', 'bum', 'reb'})
block_pattern = ['\/([^\/]+)\.', sub_sys];
elseif ismember(sub_sys, 'susp')
block_pattern = ['\$[-]+\s*SUBSYSTEM[\s\S]*?Major Role : suspension','[\s\S]*?Minor Role : ', location, '[\s\S]*?USAGE\s*=\s*''<[^>]+>/subsystems.tbl/([^'']+)\.sub'''];
elseif ismember(sub_sys, {'steering', 'wheel'})
block_pattern = ['\$[-]+\s*SUBSYSTEM[\s\S]*?Major Role : ', sub_sys, '[\s\S]*?Minor Role : ', location, '[\s\S]*?USAGE\s*=\s*''<[^>]+>/subsystems.tbl/([^'']+)\.sub'''];
elseif ismember(sub_sys, 'tir')
block_pattern = ['PROPERTY_FILE\s*=\s*''[^'']+\/([^\/]+)\.tir'''];
end
name_tokens = regexp(file_content, block_pattern, 'tokens', 'once', 'dotexceptnewline');
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1672586/image.png)
it reads well for the front suspension system (susp, spr, dpr, bum, reb, steering, wheel, tir) and returns the correct paths, but for rear suspension system, my code reads rr_susp_path = 'AA_TCAR_WHEEL_RR_22inch' instead of giving me rr_susp_path = 'AA_TCAR_SUSP_RR_RWS_230607'
It seems that my regular expression is way too broad and causing this problem. How should I fix my regular expression?
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Accepted Answer
Stephen23
on 18 Apr 2024
Edited: Stephen23
on 18 Apr 2024
"It seems that my regular expression is way too broad and causing this problem."
There are several locations where your regular expression matches unlimited amounts of (almost) anything:
I doubt that you really want unlimited matches like that.
"How should I fix my regular expression?"
Perhaps something like this:
pf1 = 'suspension';
pf2 = 'rear';
tmp = strcat('\$\s+',{'Major';'Minor'},'\s+Role\s+:\s+',{pf1;pf2},'\s+');
rgx = ['(?<=',tmp{:},'(\$.+\s+)*USAGE\s+=.+?)\w+\.sub']
str = fileread('test_example.txt');
out = regexp(str,rgx,'match','once','dotexceptnewline')
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