[Solved] How can I substring this string?

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Swift’s substring is complicated:

let str = "12:345"

if let range = str.range(of: ":") {
    let startIndex = str.index(range.lowerBound, offsetBy: 1)
    let endIndex = str.index(startIndex, offsetBy: 2)
    print(str[startIndex..<endIndex])
}

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solved How can I substring this string?