mabbas007

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mabbas007

extension String {
    /// Converts an ISO 8601 formatted `String` into `NSDateComponents`.
    ///
    /// - Note: Does not accept fractional input (e.g.: P3.5Y), must be integers (e.g.: P3Y6M).
    /// - SeeAlso: https://en.wikipedia.org/wiki/ISO_8601#Durations
    /// - Returns: If valid ISO 8601, an `NSDateComponents` representation, otherwise `nil`.
    func ISO8601DateComponents() -> NSDateComponents? {
        // Regex adapted from Moment.js https://github.com/moment/moment/blame/develop/src/lib/duration/create.js#L16
        let pattern = "^P(?:(\\d*)Y)?(?:(\\d*)M)?(?:(\\d*)W)?(?:(\\d*)D)?(?:T(?:(\\d*)H)?(?:(\\d*)M)?(?:(\\d*)S)?)?$"
        let nsstringRepresentation = self as NSString