在Swift 3.0

Question

let us = "http://example.com"
let range = us.rangeOfString("(?<=://)[^.]+(?=.com)", options:.RegularExpressionSearch)
if range != nil {
    let found = us.substringWithRange(range!)
    print("found: \(found)") // found: example
}

此代码在Swift 2中的反斜杠和点com之间提取substring。我搜索了互联网，发现rangeOfString已更改为range()。

但我仍然无法使代码在Swift 3.0中运行。你能帮帮我吗？

编辑：我正在使用swift 3 07-25 build。

Answer 1

在swift 3.0中 rangeOfString语法改变了这样。

let us = "http://example.com"
let range = us.range(of:"(?<=://)[^.]+(?=.com)", options:.regularExpression)
if range != nil {
     let found = us.substring(with: range!)
     print("found: \(found)") // found: example
}

Answer 2

在最新的swift 3.0中使用Xcode 8 Beta 6（SDK的最新更新）：

let us = "http://example.com"
let range = us.range(of: "(?<=://)[^.]+(?=.com)", options: .regularExpression)
if range != nil {
    let found = us.substring(with: range!)
    print("found: \(found)") // found: example
}