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How can I use Finder's search feature to find all files that do not match a certain criteria?

For instance, all files that don't end in ".txt" in the current folder.

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up vote 6 down vote accepted

Just typing the operand NOT before the criteria will do the trick.

So, in this case, typing NOT .txt will show all the files but the ones with the .txt extension.

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Wow! Thanks a lot! – duci9y Oct 23 '12 at 8:28

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