String extenssion and Reg-Ex

Reg-Ex.swift

//
//  StringExtension.swift
//  EddyCab
//
//  Created by Bikram on 12/24/15.
//  Copyright © 2015 Esig. All rights reserved.
//

import Foundation

extension String {
    
    mutating func addString(str: String) {
        self = self + str
    }
    var appendKM:String{
        
        return self + "Km"
        
    }
    
    var appendPlist:String{
        
        return self + ".plist"
        
    }
    
    func giveShortDate()->String{
        //"2015-12-31 11:04:06"
        let formater = NSDateFormatter()
        formater.dateFormat = "yyyy-MM-dd HH:mm:ss"
        let tempDate = formater.dateFromString(self)
        print(tempDate)
        formater.dateStyle = .MediumStyle
        return(formater.stringFromDate(tempDate!))
    }
    
    var validUserName: Bool {
        do {
            let regex = try NSRegularExpression(pattern: "[A-Z]+[0-9]?", options: .CaseInsensitive)
            
            return regex.firstMatchInString(self, options: NSMatchingOptions.WithoutAnchoringBounds, range: NSMakeRange(0,self.characters.count)) != nil
            
        } catch _ {
            //print("got error on regex")
        }
        return false
    }
    
    var isValidEmail:Bool {
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
        let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        return emailTest.evaluateWithObject(self)
    }
    
    
    var isValidName:Bool {
        let nameRegEx = "[A-Za-z]{4,}+\\s+[A-Za-z]{0,}"
        let nameTest = NSPredicate(format:"SELF MATCHES %@", nameRegEx)
        return nameTest.evaluateWithObject(self)
    }
    
    //Validate Email
    var isEmail: Bool {
        do {
            let regex = try NSRegularExpression(pattern: "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$", options: .CaseInsensitive)
            return regex.firstMatchInString(self, options: NSMatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) != nil
        } catch {
            return false
        }
    }
}