/Swift/How can i find range of a string in another string swift

How can i find range of a string in another string swift

let str = "abcde"
if let range = str.range(of: "cd") {
  let substring = str[..<range.lowerBound] // or str[str.startIndex..<range.lowerBound]
  print(substring)  // Prints ab
}
else {
  print("String not present")
}

Source: stackoverflow.com

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