Several comma-separated tags will be considered as logical AND between them. You can also use semicolon for logical OR. AND has a priority over OR and you cannot use parentheses for logical grouping. Asterisk (*) within a tag will be regarded as a mask for "any string".

Found in forums

> Notification on destroyed objective
    FORUMS / Editing / Scripting / Arma 3   ||  Tags: Fuel Depot, Inital, Medical
> Medical Zone
    FORUMS / Editing / Scripting / Arma 3   ||  Tags: Medical