Swift version: 5.1
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 4.0 is the best version of Swift to learn, so if you're starting fresh you should definitely learn Swift 4.0." let replaced = str.replacingOccurrences(of: "4.0", with: "5.0")
That will make
replaced equal to "Swift 5.0 is the best version of Swift to learn, so if you're starting fresh you should definitely learn Swift 5.0.”
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Available from iOS 2.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.