Defines the word separator for filters that follow it.
%20, custom text) to that character.
Space character_
Replace%20
Gone%20With%20The%20Wind >>> Gone_With_The_Wind
Space characterspace
Replace%20, spaces, and underscores
Me_And_Mom%20Too >>> Me And Mom Too
Space character-
Replace custom text++
Artist++Album >>> Artist-Album
Put Space Character before any filter that should use a non-space word boundary.