Swift: String contains String (Without using NSString)?

Question

I have the same problem like in this question:

How do I check if a string contains another string in Swift?

But now a few months later I wonder if it can be

Answer 1

just to demonstrate the use of options.

var string = "This is a test.  This is only a test. Not an Exam"

if string.range(of:"ex") != nil {
    print("yes")
}
if string.range(of:"ex", options: String.CompareOptions.caseInsensitive) != nil {
    print("yes")
}

Answer 2

I wrote an extension on String for SWIFT 3.0 so that i could simply call absoluteString.contains(string: "/kredit/")

extension String {
  public func contains(string: String)-> Bool {
      return self.rangeOfString(string) != nil
  }

}

Answer 3

String actually provides a "contains" function through StringProtocol.
No extension whatsoever needed:

let str = "asdf"
print(str.contains("sd") ? "yep" : "nope")

https://developer.apple.com/reference/swift/string https://developer.apple.com/documentation/swift/stringprotocol

---

If you want to check if your string matches a specific pattern, I can recommend the NSHipster article about NSRegularExpressions: http://nshipster.com/nsregularexpression/

Answer 4

Same way, just with Swift syntax:

let string = "This is a test.  This is only a test"

if string.rangeOfString("only") != nil {
     println("yes")
}

For Swift 3.0

if str.range(of: "abc") != nil{
     print("Got the string")
}