// Use `Regex.init(_:)` to build a regex from a static pattern

let greeting = Regex("hello (world|universe)")

// Use `Regex.init(string:)` to construct a regex from dynamic data, and
// gracefully handle invalid input

var validations: [String: Regex]

for (name, pattern) in config.loadValidations() {
  do {
    validations[name] = try Regex(string: pattern)
  } catch {
    print("error building validation \(name): \(error)")
  }
}

if greeting.matches("hello universe!") {
  print("wow, you're friendly!")
}

switch someTextFromTheInternet {
case Regex("DROP DATABASE (.+)"):
  // TODO: patch security hole
default:
  break
}

let greeting = Regex("hello (world|universe|swift)")

if let subject = greeting.match("hello swift")?.captures[0] {
  print("ohai \(subject)")
}

"hello world".replacingFirstMatching("h(ello) (\\w+)", with: "H$1, $2!")
// "Hello, world!"

switch text {
case Regex("hello (\\w+)"):
  if let friend = Regex.lastMatch?.captures[0] {
    print("lovely to meet you, \(friend)!")
  }
case Regex("goodbye (\\w+)"):
  if let traitor = Regex.lastMatch?.captures[0] {
    print("so sorry to see you go, \(traitor)!")
  }
default:
  break
}

let totallyUniqueExamples = Regex("^(hello|foo).*$", options: [.IgnoreCase, .AnchorsMatchLines])
let multilineText = "hello world\ngoodbye world\nFOOBAR\n"
let matchingLines = totallyUniqueExamples.allMatches(multilineText).map { $0.matchedString }
// ["hello world", "FOOBAR"]

let package = Package(
  name: "MyPackage",
  dependencies: [
    // other dependencies...
    .Package(url: "https://github.com/sharplet/Regex.git", majorVersion: 0, minor: 3),
  ]
)