val re = """\((.*?)\)""".r
val str = "(The)(example)(of)(repeating)(pattern)(in)(a)(single)(string)(I)(had)(some)(trouble)(with)(once)"
re.findAllMatchIn(str).map(_.group(1)).toList
res2: List[String] = List(The, example, of, repeating, pattern, in, a, single, string, I, had, some, trouble, with, once)