I am not really familiar with RegExp and it's really hard for me. I want to do the following:
Rewriting this:
http://www.example.com/pl?utm_source=test&utm_medium=testing&utm_campaign=test-testing
to this:
http://www.example.com/pl/?utm_source=test&utm_medium=testing&utm_campaign=test-testing
As you can see I want to add a trailing slash after "pl".
Hope anyone has an idea. (or tutorials, guides etc.)