I have a search result (created by a search agenda C-C a s) and I want to narrow it down further with additional criteria.
I tried to use the "=" key for "Narrow to entries matching regexp", but I did not find out how to combine several terms in here.
 
As long as I only enter one word, it works. But if I want to filter for criteria like
 
Word1 OR Word2
or (Word1 OR Word2) AND Word3
or (Word1 OR Word2) AND NOT (Word3 OR Word4)
 
I get no results just by entering
e.g. Word1|Word2
or Word1&Word2
 
I'm sure this is trivial, but I'm not an expert in regular expressions and currently don't see how to solve that.
:-(
 
Thanks a lot and kind regards
 
Martin