Notepad ++ Regex Replace not working on Notepad ++

Question

I tried to find every word that bar-foo has and switch them to foo-bar
so I wrote on the find (\w+)-(\w+)
and on the replacement of $2-$1
and instead of writing foo-bar he wrote $ 2- $ 1.

Yes, regular expression in search mode is enabled.
It seems that Replace Regex is not working and literally

Answer 1

In notepad ++ you will need \2-\1 as a replacement string.

Sources:
Mark speechblog

Answer 2

Use \2 \1 in the replace field.

Notepad ++ uses linux syntax as \ 1 instead of $ 1