What is the best way to determine if a string contains a character from a set in Swift

by

You can create a CharacterSet containing the set of your custom characters
and then test the membership against this character set:

Swift 3:

let charset = CharacterSet(charactersIn: "aw")
if str.rangeOfCharacter(from: charset) != nil {
    print("yes")
}

For case-insensitive comparison, use

if str.lowercased().rangeOfCharacter(from: charset) != nil {
    print("yes")
}

(assuming that the character set contains only lowercase letters).

Swift 2:

let charset = NSCharacterSet(charactersInString: "aw")
if str.rangeOfCharacterFromSet(charset) != nil {
    print("yes")
}

Swift 1.2

let charset = NSCharacterSet(charactersInString: "aw")
if str.rangeOfCharacterFromSet(charset, options: nil, range: nil) != nil {
    println("yes")
}

More Related Contents:

  1. Nested Dictionary in my swift application
  2. Dynamic trim double [closed]
  3. Swift do-try-catch syntax
  4. How to create a global variable?
  5. Swift: print() vs println() vs NSLog()
  6. Deleting list elements from SwiftUI’s List
  7. How can I make a weak protocol reference in ‘pure’ Swift (without @objc)
  8. Check password string strength criteria in Swift
  9. Implementing copy() in Swift
  10. Prevent dismissal of UIAlertController
  11. Passing lists from one function to another in Swift
  12. How do I declare a variable that has a type and implements a protocol?
  13. Convert a Date (absolute time) to be sent/received across the network as Data in Swift?
  14. How does one make an optional closure in swift?
  15. How to pass multiple enum values as a function parameter
  16. SwiftUI: Forcing an Update
  17. How to use openURL for making a phone call in Swift?
  18. How can I get a real IP address from DNS query in Swift?
  19. Get class name of object as string in Swift
  20. Getting “file not found” in Bridging Header when importing Objective-C frameworks into Swift project
  21. Why is ‘nil’ not compatible with ‘UnsafePointer’ in Swift 3?
  22. “classname has no member functionname” when adding UIButton target
  23. AlamoFire asynchronous completionHandler for JSON request
  24. Setting the TimelineProvider refresh interval for Widget
  25. @noescape attribute in Swift 1.2
  26. Swift: shortcut unwrapping of array of optionals
  27. How do I perform an auto-segue in Xcode 6 using Swift?
  28. AVAudioEngine downsample issue
  29. Can Swift convert a class / struct data into dictionary?
  30. swift sphere combine star data

Leave a Comment