doesn't match the regex (see also 'About regex' section)
contains
doesn't contain
starts with
doesn't start with
ends with
doesn't end with
exists
doesn't exist
is empty
ADVANCED FILTER
An "Advanced" filter can be used when a simple one is not sufficient.
The simple filter will be automatically transcribed into the advanced one, but the opposite is not possible, as advanced functions are not supported by the simple filter.
From simple filter...
...to advanced filter
With Advanced filter, you can use formula and advanced functions, simply click on the button on the right of the field to see all available functions.