replacing all occurrences of a string in a file using regexp

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Robert Jones
Robert Jones 2022-11-10
评论： Robert Jones 2022-11-14
Hello,
I have a very large file that contains sections like these below
VariableProp('GND_R', 'UD', '', '130mm')
VariableProp('T', 'UD', '', '1mm')
VariableProp('RC', 'UD', '', '38mm')
.
.
.
VariableProp('ALFAD', 'UD', '', '255deg')
I need to find all the occurrences of VariableProp(VarName, 'UD', '', VarValue) in the file, and change the VarValue
I am still learning the regexp topic, so in this case help would be appreciated
Thank you
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Chris
Chris 2022-11-11
I've found https://regexr.com/ to be a useful resource for figuring out regular expressions (though there may be some minor disagreement with regexp(), not sure), but Jan's prototype is more Matlabby, easier to understand, and perhaps more performant.
Rik
Rik 2022-11-11
You are not giving many details.
What are the requirements for those names? Can any characters occurs between those quotes? If that includes single quotes, how are those escaped?
You say you want to change the VarValue part, but you haven't given any indication of what kind of change you want to make.

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Jan
Jan 2022-11-11
编辑：Jan 2022-11-11
Is it required to use regexp? If not:
C = readlines(FileName);
m = startsWith(C, "VariableProp('" + VarName + ", 'UD', '', ");
C(m) = sprintf("VariableProp('%s', 'UD', '', '%g%s')", VarName, newValue, newUnit);
writelines(FileName, C);
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Jan
Jan 2022-11-11
@Robert Jones: I guess you have these input data beside the file:
newData = {'GND_R', '130mm'; ...
'T', '1mm'; ...
'RC', '38mm'};
If you post the format of your input, a better matching suggestion could be given.
Then you can expand my code:
C = readlines(FileName);
for k = 1:height(newData)
VarName = newData{k, 1};
Value = newData{k, 2};
m = startsWith(C, "VariableProp('" + VarName + ", 'UD', '', ");
C(m) = sprintf("VariableProp('%s', 'UD', '', '%s')", VarName, Value);
end
writelines(FileName, C);

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