RedirectFunctionalTest::testPathChangeRedirects in core/modules/redirect/tests/redirect.test
Tests renaming automatic aliases in a circular loop.
redirect_edit_form_validate in core/modules/redirect/redirect.admin.inc
Form validate handler; validate an URL redirect
redirect_get_current_redirect in core/modules/redirect/redirect.module
Attempt to find redirect from current path, query string, and language code.
redirect_path_delete in core/modules/redirect/redirect.module
Implements hook_path_delete().
redirect_path_insert in core/modules/redirect/redirect.module
Implements hook_path_insert().
redirect_path_update in core/modules/redirect/redirect.module
Implements hook_path_update().
redirect_url_inbound_alter in core/modules/redirect/redirect.module
Implements hook_url_inbound_alter().