Consider using regex for URL pattern matching about urlnavigator HOT 3 CLOSED

struct User {
  init(id: Int) {}
}

func match(pattern: String, in string: String) -> [String]? {
  guard let regex = try? NSRegularExpression(pattern: pattern, options: []) else { return nil }
  let range = NSRange(location: 0, length: string.characters.count)
  guard let match = regex.firstMatch(in: string, options: [], range: range) else { return nil }
  return (0..<match.numberOfRanges)
    .map { match.rangeAt($0) }
    .map { (string as NSString).substring(with: $0) }
}

URLMatcher.default.addURLValueMatcherHandler(for: "monthyear") { string -> Any? in
  guard let groups = match(pattern: "([a-z]{3})(\\d{2})", in: string) else { return nil }
  let month = groups[1]
  guard let year = Int(groups[2]) else { return nil }
  return (month: month, year: year)
}

URLMatcher.default.addURLValueMatcherHandler(for: "user") { string -> Any? in
  guard let groups = match(pattern: "user-(\\d+)", in: string) else { return nil }
  guard let userID = Int(groups[1]) else { return nil }
  return User(id: userID)
}

Navigator.map("http://example.com/<monthyear:monthyear>/<user:user>") { url, values in
  print("values:", values) // ["monthyear": ("jun", 16), "user": User()]
  return true
}

Navigator.open("http://example.com/jun16/user-1234")