Email Address Validation

Contact Form 7 uses WordPress function is_email() to validate email fields, and it doesn’t support IDNs for now. You can customize its behavior using is_email or wpcf7_is_email filter hook.

@takayuki

Thank you for the information.

Because there are lots of IDNs, I will need to make the input field for email addresses a plain text input and add some validation to check for @.

Can anyone offer any references to a filter hook that:
1. Reference an input field by it’s ID
2. Check of some form of validation

If I can see an example or get an idea of how to form the hook, I should be able to rewrite/manipulate it to do what I need.

I guess I just need to simplify something like https://contactform7.com/2015/03/28/custom-validation/

From looking at:

– https://stackoverflow.com/questions/32746270/how-to-validate-contact-form-7-field-from-functions-php-file-in-wordpress
–

I just need to tweak this filter code using preg_match to validate a tag:text* name:your-email for the ‘@’ where it outputs an error: ‘Your email address seems invalid’ if there is no ‘@’ character in the text field.

Another resource: https://contactform7.com/2015/03/28/custom-validation/

Anyone any good at writing filters that can help?

This code seems to do the trick if anyone else ever needs it.

// Checks for '@' in contact form 7 text* field name: your-email
add_filter( 'wpcf7_validate_text*', 'custom_validate', 20, 2 );

function custom_validate( $result, $tag ) {
$tag = new WPCF7_Shortcode( $tag );

if ( $tag->name = 'your-email' ){
    $symbol = isset( $_POST['your-email'] ) ? trim( $_POST['your-email'] ) : '';
    if (!preg_match( '/@/i', $symbol )) {
       $result->invalidate( $tag, "This email address is missing the @ symbol" );
    }
}
return $result;
}

Thanks