Android SDKにあるみたい。そこらにあるダメなバリデータとは異なり、 foo+bar@gmail.com のように+を含むものであっても認めてくれる。
boolean ok = android.util.Patterns.EMAIL_ADDRESS.matcher(input).matches();
cf. http://stackoverflow.com/questions/9355899/android-email-edittext-validation
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