fcn f(text,p){
   if( Void!=(n:=text.rfind(p)) and n+p.len()==text.len() )
      println("tail gunner") else println("Nope")
}
f("foobar","r"); f("foobar","ar"); //--> tail gunners
f("foobar","ob");  //--> Nope
f("foobarfoobar","bar"); //--> tail gunner