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  1. object Main extends App {
  2.   object Email {
  3.     def apply(user: String, host: String) = user + "@" + host
  4.     def unapply(input: String): Option[(String, String)] = {
  5.       input.indexOf("@") match {
  6.         case x if (x > 0) => Some((input.substring(0, x), input.substring(x + 1)))
  7.         case _ => None
  8.       }
  9.     }
  10.   }
  11.  
  12.   "lispgovno@govnokod.ru" match {
  13.     case Email(user, host) => println("See user <" + user + "> at domain <" + host + ">")
  14.     case _ => println("Well...")
  15.   }
  16.   "lol" match {
  17.     case Email(user, host) => println("Wow... strange email")
  18.     case _ => println("OK, <lol> is not an email")
  19.   }
  20. }
Success #stdin #stdout 0.29s 247552KB
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Standard input is empty
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See user <lispgovno> at domain <govnokod.ru>
OK, <lol> is not an email
https://ideone.com/2xA5xW
language:
Scala (scala 2.12.8)
created:
13 years ago
visibility:
public

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