Simplify regexprep to avoid having to use a loop

Question

SpeedyGonzales 2015-3-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/195368-simplify-regexprep-to-avoid-having-to-use-a-loop

回答： SpeedyGonzales 2015-4-1

Hi,

I have a list of Identifiers representing a hierarchy that I need to change slightly in order to process them. The Identifiers are use '_' in order to separate hierarchy levels. What I want to do is to replace all '_' from the 3rd '_' onwards.

I was able to find the regexprep code, but I am only able to replace one '_' at the time and then using a loop. The code I was able to come up with looks as follows:

clear;clc;
nodes ={'RB_AA_AL_CTA'; 'RB_AA_AL_HDGE'; 'RB_AA_CA'; 'RB_AA_EH'; 'RB_AA_EQ_DMLC_EUR'; 'RB_AA_EQ_DMLC_USD'; 'RB_AA_EQ_DMLC_JPY';};
for x=1:length(nodes)
    for y = 2: length(cell2mat(strfind(nodes(x),'_')))
        nodes(x) = regexprep(nodes(x),'_','-',3);
    end
end

I am wondering now whether it is possible to simplify this such that I don't have to use a loop? Thanks Sven

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Answer 1

per isakson 2015-4-1

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https://ww2.mathworks.cn/matlabcentral/answers/195368-simplify-regexprep-to-avoid-having-to-use-a-loop#answer_173512

编辑：per isakson 2015-4-1

在 MATLAB Online 中打开

At least different

    for jj = 1:length(nodes)
        ix_ = find(nodes{jj}=='_');
        if length(ix_) >= 3
            nodes{jj}(ix_(3):end) = strrep(nodes{jj}(ix_(3):end), '_', '-' );
        end
    end

however, slower :(

&nbsp

This is better

    for jj = 1:length(nodes)
        ix_ = find(nodes{jj}=='_');
        if length(ix_) >= 3
            nodes{jj}(ix_(3:end)) = '-';
        end
    end