sajt.scala

def task1(str: String): Boolean = {

    val vowelR = """[a,e,i,o,u]"""

    @tailrec
    def processTask1(arr: List[String], prevChar: String, vowelCount: Int, hasDouble: Boolean): Boolean = {
      arr match {
        case Nil => vowelCount >= 3 && hasDouble;
        case "a" :: "b" :: xs => false
        case "c" :: "d" :: xs => false
        case "p" :: "q" :: xs => false
        case "x" :: "y" :: xs => false
        case c :: xs => processTask1(xs, c, vowelCount + (if (c.matches(vowelR)) 1 else 0), hasDouble || c == prevChar)
      }
    }
    processTask1(str.split("").toList, "", 0, hasDouble = false)

  }