I've got two text layers and the second one needs to have the same Source Text as the first one. So far it's pretty straight forward (I just pick whip the hell out of it), but.... in the second layer I want to replace all the spaces with "_"-s
So "this is just a test" in the first layer should become "this_is_just_a_test" in the second layer.

At end of auto generated expression add this code...
.toString().split(" ").join("_");

Ukramedia FB Group, response post by Sergei: https://www.facebook.com/groups/ukramedia/permalink/1373446416511460