https://some.site/bitrix/services/main/ajax.php?action=some:action
/ajax/modal/some_modal/
array ( 'CONDITION' => '#^(?:/en)?/ajax/modal/([^/]+)/.*?$#', 'RULE' => 'action=enex:core.modal.$1', 'PATH' => '/bitrix/services/main/ajax.php', 'ID' => '', 'SORT' => 300, )