用于匹配正则表达式的字符串扩展-解网

问：

我有 2 个用 Swift 2 编写的函数，但 Apple 强迫我迁移到 Swift 4，我无法修复这些函数。

extension String {
    func stringsMatchingRegularExpression(expression: String) -> [String] {
        if let range = self.rangeOfString(expression, options: NSString.CompareOptions.RegularExpressionSearch, range: nil, locale: nil) {
            return [self[range]] + self[range.endIndex..<self.endIndex].stringsMatchingRegularExpression(expression)
        }
        return []
    }

    func stringsMatchingRegularExpressionLarge(expression: String) -> [String] {
        var result = [String]()
        var currentRange = self.characters.indices
        while let range = self.rangeOfString(expression, options: NSString.CompareOptions.RegularExpressionSearch, range: currentRange, locale: nil) {
            result.append(self[range])
            currentRange.startIndex = range.endIndex
        }
        return result
    }
}

第一个函数的返回是我无法解决的问题。第三行在 Swift 4 中if let range = self.range(of: expression, options: NSString.CompareOptions.regularExpression, range: nil, locale: nil){

在第二个函数中，我不知道 .characters 是如何迁移的。

swift swift2 ns正则表达式 swift4.2

extension String {
    func stringsMatchingRegularExpression(expression regex: String) throws -> [String] {
        let regex = try NSRegularExpression(pattern: regex)
        let results = regex.matches(in: self,
                                    range: NSRange(self.startIndex..., in: self))
        return results.map {
            String(self[Range($0.range, in: self)!])
        }
    }
}

- 更迅捷的风格：

extension String {

    func matching(expression regex: @autoclosure () throws -> NSRegularExpression) rethrows -> [String] {
        let results = try regex().matches(in: self, range: NSRange(self.startIndex..., in: self))
        return results.map {
            String(self[Range($0.range, in: self)!])
        }
    }

    func matching(pattern regexPattern: String) throws -> [String] {
        return try self.matching(expression: NSRegularExpression(pattern: regexPattern))
    }
}

用于匹配正则表达式的字符串扩展

String extension for matching regular expression

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- 更迅捷的风格：

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