正则表达式获取组名？

Question

寻找一种使用Swift获取组名的方法，我在C＃（How do I get the name of captured groups in a C# Regex?）中使用GetGroupNames找到了信息，但找不到类似的东西。希望能够说出一个小组的存在。

目前使用下面的代码...

let search = "Agora.2010.1080p.BluRay.x264.mp4"
let regex "^(Agora.)(?<"group name">2010)?"
let return_results = regex(for: regex, in: search)

func regex(for expression: String, in string: String) -> [String]? {

    guard let regex = try? NSRegularExpression(pattern: expression, options: [.caseInsensitive]) else { return nil }
    let results = regex.matches(in: string, range: NSRange(string.startIndex..., in: string))
    guard !results.isEmpty else { return nil }

    var values: [String] = []
    guard regex.numberOfCaptureGroups > 0 else { return nil }

    for r in 1...(regex.numberOfCaptureGroups) {
        let range = results[0].range(at: r)

        if range.length > 0 {
            let start = string.index(string.startIndex, offsetBy: range.location)
            let end = string.index(start, offsetBy: range.length)
            let value = string[start..<end]
            if !value.isEmpty {
                let value_string = String(value)
                values.append(value_string)
            }
        }
    }
    return values

此刻，它仅查找任何组。我要返回的是[[group name]：“ value”]的字典列表。我尝试从附加链接...“ regex.Match（line）.Groups”和“ regex.GetGroupNames（）”尝试不存在。