t('Regular expression (POSIX multibyte)'), 'description' => t('Validates user-entered text against a specified regular expression using mb_ereg* function\'s family.'), 'handler' => array( 'class' => 'field_validation_regex_validator', ), ); class field_validation_regex_validator extends field_validation_validator { /** * Validate field. */ public function validate() { mb_regex_encoding('UTF-8'); $regex = $this->rule->settings['data']; if ($this->value != '' && (!mb_ereg("$regex", $this->value))) { $this->set_error(); } } /** * Provide settings option */ function settings_form(&$form, &$form_state) { $default_settings = $this->get_default_settings($form, $form_state); //print debug($default_settings); $form['settings']['data'] = array( '#title' => t('Regex code'), '#description' => t("Specify regex code to validate the user input against."), '#type' => 'textarea', '#default_value' => isset($default_settings['data']) ? $default_settings['data'] : '', ); parent::settings_form($form, $form_state); } }