val userPartRfc2822 = """([A-Za-z0-9+_.-]+)"""
    val userPartRfc2822OrSpace = """([A-Za-z0-9+_.-]+| )"""
    val atInform = """(@informatik.haw-hamburg.de)"""
    val dotUnderscore = """(.|_)"""
    val gmail = """(@gmail.com)"""
    val googlemail = """(@googlemail.com)"""

    //  _?_@informatik.haw-hamburg.de
    val firstPattern = (userPartRfc2822OrSpace+dotUnderscore+userPartRfc2822OrSpace+atInform).r

    //    _@informatik.haw-hamburg.de
    val secondPattern = (userPartRfc2822+atInform).r

    //_#@informatik.haw-hamburg.de
    val thirdPattern = (userPartRfc2822+"""(\d)"""+atInform).r


    //_._@gmail.com oder _@googlemail.com
    val fourthPattern = (userPartRfc2822OrSpace+"""(\.)"""+userPartRfc2822OrSpace+gmail).r
    val fifthPattern = (userPartRfc2822+googlemail).r

    //_._@_.de oder _._@_.com
    val sixthPattern = (userPartRfc2822OrSpace+"""(\.)"""+userPartRfc2822OrSpace+"""(@)"""+userPartRfc2822+"""(\.de|\.com)""").r