It's easy to replace text inside a string thanks to the method
replacingOccurrences(of:). This is a string method, and you tell it what to look for and what to replace it with, and you're done.
let str = "Swift 3.0 is the best version of Swift to learn, so if you're starting fresh you should definitely learn Swift 3.0." let replaced = str.replacingOccurrences(of: "3.0", with: "4.0")
That will make
replaced equal to "Swift 4.0 is the best version of Swift to learn, so if you're starting fresh you should definitely learn Swift 4.0.”
Available from iOS 2.0
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