custom/form_helper/form_helper_validation/form_helper_validation.demo.inc, line 126
form_helper_validation_demo_custom_validation_rule($element, &$form_state)Example of a custom validation rule.
<?php
function form_helper_validation_demo_custom_validation_rule($element, &$form_state) {
$custom_rule = array(
'regex' => '/abc/',
'message' => "Custom validation rule is not valid. You entered '@value'. Please enter 'abc'.",
);
form_helper_validation_validate_element($custom_rule, $element, $form_state);
}
?>