form_process_autocomplete in includes/form.inc
Process function to prepare autocomplete data.
menu_edit_item_validate in modules/menu/menu.admin.inc
Validate form values for a menu link being added or edited.
path_admin_form_validate in modules/path/path.admin.inc
Form validation handler for path_admin_form().
system_site_information_settings_validate in modules/system/system.admin.inc
Validates the submitted site-information form.