A B C D E F G I J L M N P R S T U V _

## _

_testEmailUserName1() - クラス のメソッドCheckEmailTest
  Write this test according to parts of RFC, as opposed to the type of character that is being tested.
_testEmailUserName2() - クラス のメソッドCheckEmailTest
  Write this test according to parts of RFC, as opposed to the type of character that is being tested.
_testEmailUserName3() - クラス のメソッドCheckEmailTest
  Write this test according to parts of RFC, as opposed to the type of character that is being tested.

A B C D E F G I J L M N P R S T U V _