如何在swift 4中获取字符串中文本的索引？

来自服务器的字符串为：

"Please review the work schedule for personnel associated with this device\nhttps://test.abcdxyz.com/media?q=kp97k73a9omm"

我需要从以下字符串中提取url：

“”

如何在swift 4中执行此操作

阅读了有关字符串的内容后，我发现：

if msg.contains("https://") {
 let x = msg.range(of: "https://")?.lowerBound
 let str = msg.substring(from: x!)
            print(str)
}

NSDataDetecter也是一个很酷的解决方案。 在这种情况下，哪一个更可靠？？？

智能解决方案是

您不需要从匹配中创建

范围来提取子字符串，有一个方便的
url
属性。
您可以使用它来轻松检测字符串中的url

let inputString = "Please review the work schedule for personnel associated with this device\nhttps://test.abcdxyz.com/media?q=kp97k73a9omm"

let urlDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
let getMatches = urlDetector.matches(in: inputString, options: [], range: NSRange(location: 0, length: inputString.utf16.count))

for match in getMatches {
    guard let range = Range(match.range, in: inputString) else { continue }
    let url = inputString[range]
    print(url)
}

更多详情：

let inputString = "Please review the work schedule for personnel associated with this device\nhttps://test.abcdxyz.com/media?q=kp97k73a9omm"

let urlDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
let getMatches = urlDetector.matches(in: inputString, options: [], range: NSRange(location: 0, length: inputString.utf16.count))

for match in getMatches {
    guard let range = Range(match.range, in: inputString) else { continue }
    let url = inputString[range]
    print(url)
}