contact_category_edit_form_validate in core/modules/contact/contact.admin.inc

Form validation handler for contact_category_edit_form().

email_example_form_validate in modules/examples/email_example/email_example.module

Form validation logic for the contact form.

email_field_validate in core/modules/email/email.module

Implements hook_field_validate().

form_validate_email in core/includes/form.inc

Form element validation handler for #type 'email'.

system_install in core/modules/system/system.install

Implements hook_install().

update_settings_validate in core/modules/update/update.admin.inc

Form validation handler for update_settings().

UserStorageController::preSave in core/modules/user/user.entity.inc

Overrides EntityDatabaseStorageController::preSave().

user_account_form_validate in core/modules/user/user.module

Form validation handler for user_account_form().

user_login_authenticate_validate in core/modules/user/user.module

Second phase validation handler on the login form.

user_login_final_validate in core/modules/user/user.module

The final validation handler on the login form.

user_login_name_validate in core/modules/user/user.module

First phase validation handler for the login form.