[Swift] regular expression

- 이메일 형식

 func isValidEmail(email:String?) -> Bool {
        
        guard email != nil else {return false}
        
           let regEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        
           let pred = NSPredicate(format:"SELF MATCHES %@", regEx)
        
           return pred.evaluate(with: email)
}

 

- 비밀번호(8자리 이상, 영어 + 숫자 + 특수문자)

    func isValidPassword(pw: String?) -> Bool {
        
        guard pw != nil else {return false}
        
            let regEx = "^(?=.*[A-Za-z])(?=.*[0-9])(?=.*[!@#$%^&*()_+=-]).{8,50}"

            let pred = NSPredicate(format:"SELF MATCHES %@", regEx)
        
            return pred.evaluate(with: pw)
    }