UIDevice+Username.swift

import Foundation

extension UIDevice {
    
    /**
     Try to get the username from the device name using common knows
     default device names format.
     
     - copyright: Owen Godfrey on [StackOverflow](http://stackoverflow.com/questions/8261961/better-way-to-get-the-users-name-from-device)
     - remark: Original regexpr improved to support custom name with model included eg. `<username>'s iPhone 6S`
     
     - returns: Username found or the device name itself as default value
     */
    func username() -> String {
        
        let deviceName = self.name
        let expression = "^(?:iPhone|phone|iPad|iPod)\\s+(?:de\\s+)?(?:[1-9]?S?\\s+)?|(\\S+?)(?:['']?s)?(?:\\s+(?:iPhone|phone|iPad|iPod)\\s+(?:[1-9]?S?\\s+)?)?$|(\\S+?)(?:['']?的)?(?:\\s*(?:iPhone|phone|iPad|iPod))?$|(\\S+)\\s+"
        
        var username = deviceName
        
        do {
            let regex = try NSRegularExpression(pattern: expression, options: .CaseInsensitive)
            let matches = regex.matchesInString(deviceName as String,
                                                options: NSMatchingOptions.init(rawValue: 0),
                                                range: NSMakeRange(0, deviceName.characters.count))
            let rangeNotFound = NSMakeRange(NSNotFound, 0)
            
            var nameParts = [String]()
            for result in matches {
                for i in 1..<result.numberOfRanges {
                    if !NSEqualRanges(result.rangeAtIndex(i), rangeNotFound) {
                        nameParts.append((deviceName as NSString).substringWithRange(result.rangeAtIndex(i)).capitalizedString)
                    }
                }
            }
            
            if nameParts.count > 0 {
                username = nameParts.joinWithSeparator(" ")
            }
        }
        catch { NSLog("[Error] While searching for username from device name") }
        
        return username
    }
}

Thank you, this is great!

Swift 3 Implementation + Removing string after last punctuation component

extension UIDevice {
    var username:String {
        let deviceName = self.name
        let expression = "^(?:iPhone|phone|iPad|iPod)\\s+(?:de\\s+)?(?:[1-9]?S?\\s+)?|(\\S+?)(?:['']?s)?(?:\\s+(?:iPhone|phone|iPad|iPod)\\s+(?:[1-9]?S?\\s+)?)?$|(\\S+?)(?:['']?的)?(?:\\s*(?:iPhone|phone|iPad|iPod))?$|(\\S+)\\s+"
        
        var username = deviceName
        
        do {
            let regex = try NSRegularExpression(pattern: expression, options: .caseInsensitive)
            let matches = regex.matches(in: deviceName as String,
                                                options: NSRegularExpression.MatchingOptions.init(rawValue: 0),
                                                range: NSMakeRange(0, deviceName.characters.count))
            let rangeNotFound = NSMakeRange(NSNotFound, 0)
            
            var nameParts = [String]()
            for result in matches {
                for i in 1..<result.numberOfRanges {
                    if !NSEqualRanges(result.rangeAt(i), rangeNotFound) {
                        nameParts.append((deviceName as NSString).substring(with: result.rangeAt(i)).capitalized)
                    }
                }
            }
            
            if nameParts.count > 0 {
                username = nameParts.joined(separator: " ")
                username =   username.components(separatedBy: .punctuationCharacters).dropLast()
                    .joined()
                    .components(separatedBy: .whitespaces)
                    .filter{!$0.isEmpty}.joined()
            }
        }
        catch { NSLog("[Error] While searching for username from device name") }
        return username
    }
}

Updated for Swift 5, Chinese, and broader language compatibility using a largely non-Regex approach and NameComponentsFormatter. https://gist.github.com/wingovers/5897dda804a8f2e6280ec52a79340a5e

Thanks @wingovers for your work on this 👍