import RegexBuilder

let regex = Regex {
   "Name:"
   OneOrMore(.whitespace)
   OneOrMore {
      CharacterClass("a"..."z", "A"..."Z")
   }
}
let message = "Name: John"
let result = message.matches(of: regex)
if !result.isEmpty {
   print(result[0].output)
   // "Name: John"
}