New in Symfony 4.1: HTML5 Email Validation

Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
Contributed by
Billie Thompson
in #24442.
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 Symfony version.
Validation of email 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 real-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 previousstrict = false
.strict
: performs the RFC compliant validation and requires to install the `egulias/email-validator` library. It's like the previousstrict = true
.html5
uses the same regular expression of the HTML5 specification. It's the best balanced value, providing fast and good validation without requiring external libraries.
Configuring the email validation in the framework
Contributed by
Christian Flothmann
in #25478.
When using the Validator component inside a Symfony application, you can set
the email address validation mode with the new email_validation_mode
option:
1 2 3 4 5
# config/packages/framework.yaml
framework:
validation:
# possible values: 'loose', 'strict', 'html5'
email_validation_mode: 'html5'
Help the Symfony project!
As with any Open-Source project, contributing code or documentation is the most common way to help, but we also have a wide range of sponsoring opportunities.
Comments



Comments are closed.
To ensure that comments stay relevant, they are closed for old posts.