See characters in CharacterSet (swift)

CharacterSetExtension.swift

extension CharacterSet {
    var characters:[UnicodeScalar] {
        var chars = [UnicodeScalar]()
        for plane:UInt8 in 0...16 {
            if self.hasMember(inPlane: plane) {
                let p0 = UInt32(plane) << 16
                let p1 = (UInt32(plane) + 1) << 16
                for c:UInt32 in p0..<p1 {
                    if let us = UnicodeScalar(c) {
                        if self.contains(us) {
                            chars.append(us)
                        }
                    }
                    
                }
            }
        }
        return chars
    }
}