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Billie Thompson  - 133327 - HTML5 Email Validation (Symfony Blog)

Symfony 4.1 will be released in May 2018. This is the first article of the
series that shows the most important new features introduced by this
version.


Validation of addresses is one of those never-ending debates among
developers. Some argue that you can’t truly validate them programmatically and
that you must always send a confirmation email. Others argue that RFC 5322
compliant programmatic validation is enough for -world applications.

Symfony always made this choice yours with the strict option of the
Email validation constraint. When false, the email address is validated
against a simple regular expression. If true, a RFC compliant validation is
done using the egulias/email-validator third-party library.

However, the regular expression used to validate email addresses was too simple.
That’s why in Symfony 4.1 we decided to start using the same
email validation done by HTML5. In practice, we’ve deprecated the strict
option in favor of a new mode option with these values:

  • loose: uses a simple regular expression to find the most obvious mistakes
    (not including a @ character, etc.). It’s like the previous strict = false.
  • strict: performs the RFC compliant validation and requires to install the
    egulias/email-validator library. It’s like the previous strict = true.
  • uses the same regular expression of the HTML5 specification. It’s
    the best balanced value, providing fast and good validation without requiring
    external libraries.

Christian Flothmann  - b5fe043ff5cd47b3b35d95e78fce5539 - HTML5 Email Validation (Symfony Blog)

When using the Validator component inside a Symfony application, you can set
the email address validation mode with the new email_validation_mode option:

# config/packages/framework.yaml
framework:
    validation:
        # possible values: 'loose', 'strict', 'html5'
        email_validation_mode: 'html5'



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