# Scala

object HelloWorld {
   def main(args: Array[String]) {
      println("Hello, world!")
      val stringCleaner = (s:String) => {
        if (s == null) null else s.toLowerCase.replaceAll("""<[^>]*>""", "").replaceAll("""\.([0-9])""","""p$1""").replaceAll("""[\p{Punct}]"""," ").replaceAll("""\s+""", " ").trim()
      }
      println(stringCleaner("Hello, world!    I have you. \t do you love me? \n   ..1314520<secret>?")) // \p{Punct}：標點符號 !“#$%&'()*+,-./:;<=>?@[]^_`{|}~
   }
}

$scalac *.scala
$scala HelloWorld
Hello, world!
hello world i have you do you love me ha1314520

1. 全部變成小寫
2. 把
3. 把尖括號 <love you> 拿掉
4. 把 .數字 換成 p數字
5. 移掉所有表點符號
6. 把連續的空白/tab/換行 換成一個空白