2019 Correct Answer
To properly support email validation in Dart/Flutter, please see the pub.dev package email_validator.
Source: https://github.com/fredeil/email-validator.dart
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This properly supports:
- TLDs [optionally]
- International Domains [optionally]
- Filtered domains (e.g. user+filter@domain.name)
- Domainless addresses (e.g. user@localhost)
