How to delete text file some perticular lines using Matlab script

Hi I have one text file and in which if variable is not matching i need to delete that lines till end For example file is like this

FESTW Cbx_asdf_gh Xyz xyz Abs abs Ster sox END

GHRT Vbx_asdf_gh Xyz ans Anstg END

GBLOS xxx_asdf_gh Sstf Sgohe END

SO if the variable is not matching with defined variable in this case last one xxx then i need to delete that whole lines but i don't know how to delete lines till END because everytime END is ending at diff position like line no is not standard so how to delete that whole lines starting from GBLOS TO END (GBLOS xxx_asdf_gh Sstf Sgohe END)

So can you help me how to delete these lines it is having 40+ end like this and some variable is not matching so i need to delete all that till end

Thank you

Answer 1

[Mathieu NOE]

hello

its' a bit confusing.... in other words you want to keep the lines that contain a certain variable name ?

then try this :

ll = readlines('text.txt'); % read text and convert to strings

defined_variable = 'Anstg'; % if ll does not contain that variable name , delete lines where it's missing

for ci = 1:numel(ll)
    tf = strfind(ll(ci),defined_variable);
    if isempty(tf)
        check(ci) = false;
    else
        check(ci) = true;
    end
end


ll_out = ll(check)

[vivek vala]

Hello thank you for your time Here in this case it will delete useful line also

FESTW Cbx_asdf_gh; Xyz; xyz Abs; abs Ster sox; END;

See here Cbx is present so i want this till END

But instead of Cbx if it is line Dxx Then i want to delete that till END only keep Cbx

FESTW Dxx_asdf_gh; Xyz ; xyz Abs ; abs Ster sox ; END;

Here i need that till END beacuse Dxx is not useful for me

So i have this type of text file where 40+ Cbx is present and other then that also there so i want to delete extra lines without Cbx and keep Cbx line only And that extra line i want to delete permenent because i am able to delete that but still blank line is there that i don't want Thank you

[Mathieu NOE]

hello

it's still not clear to me

other that you want to keep "Cbx line" i don't fully understand the rest.

If you could wirte down what is / are the key words to keep lines (or key words to delete lines) , it would make things more understandable to me

[Mathieu NOE]

hello

Problem solved ?