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You can use regular expression “(?<!:) ” to replace the white spaces ” ” occurrences where it is not preceded by colon punctuation “:”: let string = “Apple: Fruit Tomato: Vegetable Iron: Material” let pattern = “(?<!:) ” let result = string.replacingOccurrences(of: pattern, with: “\n”, options: .regularExpression) print(result) // “Apple: Fruit\nTomato: Vegetable\nIron: Material\n” solved String … Read more