How to match a string not followed by a word using sed

Question

I need to delete all strings consisting of a hyphen followed by a whitespace, but only when the whitespace is not followed by the word \"og\". Example file:

Kult         


        

Answer 1

This might work for you (GNU sed):

sed -r 's/(- (og|eller))|- /\1/g' file

This relies on alternation to re-replace specific cases and the empty backreference to replace the general case.