Edit this command to also include every lowercase uppercase letter: find . -type f -not -name "*recept-elkeszitese*" -exec rm -f {} \;

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Edit the command so that it doesn't matter if there is an uppercase or lowercase in the given string.
find . -type f -not -name "*recept-elkeszitese*" -exec rm -f {} \;
So I want to delete all the files except those which contains the string 'recept-elkeszitese' in the file name and it shouldn't make any difference if one of its letter is uppercase or all the letters. Currently the command delete every other version like: 'Recept-elkeszitese' 'RECEPT-ELKESZITESE' etc. except this: 'recept-elkeszitese'
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