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

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

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