Regular Expression for no value

[hluxem]

Hello,

I want to filter files with no value in location. So I used the filter Metadata Search, selected the location tag and tried to use a regular expression for empty. Thought that's easy, but all I could find in my search is that "^$" or "^.{0}$" should work for an empty string, but I can't make that work. So I used a dot and negated the filter which works fine, just seems backward. Is there an expression or another way to find/specify empty tags directly?

Thanks,

Heiner

[Mario]

Why don't you use the "with value" option and invert?
This gives you all files without a value in the selected tag:

[hluxem]

Thanks, as I made it work with the meta data search I did not try different options.
I have not done much with regular expressions yet and thought I miss something. I expected there is some easy expression to find an empty value. While I found my work around, I thought I ask as reference for the future.

Heiner

[Mario]

I doubt there is a regular expression for 'nothing'.

The option to filter for files with a value (and optionally invert) has been designed to handle exactly this common case => to find files without value.