So it worked for me, i did this
If(myVar.Contains(myVar1),“myVar1”, If(myVar.Contains(myVar2),“myVar2”, If(myVar.Contains(myVar3),“myVar3”, If(myVar.Contains(myVar4),“myVar4”, “Default”))))
So for those who wants to use variable on case switch, use this… 
Big thanks to @Ellboy and @Palaniyappan