Scala easiest partial string matching

I have a quick question about Scala part string matching. Consider the example:

val s1 = "game of thrones"
val s2 = Array["throne videos", "watch game", "game of thrones stuff"]

and I want to do some kind of regex or matching or .contains such that in the result should be some thing like

val result = Array["videos", "watch", "stuff"] 

where any word in the string that is repeated in s1 is cut out. What would be the most efficient way?

I am currently doing it by making s1 into a regex and applying it to each line of s2, but I am also having trouble with getting it to work.

Much thanks!