Hello,
So in the last release notes it says: Fixed Stop on first find for regular expressions in the Multi-Replace plugin
It still only replaces the first found match. When I search here, I see more people with similar problems, however, I can't open those tickets as they are hidden. So I'm also not sure from when they are.
Changing the setting doesn't have any effect for regular expressions, it does however for regular text.
Cheers,
Roderic