You can detect if the user is accessing a page that starts with a specific text using the URL_PATH and IFMATCH functions. An example of use is to redirect users to the home page if they directly access the /header/ and /footer/ pages. See how it works:

:VAR(URL_PATH).IFMATCH(^/header).THEN.GOTO(/index/).ELSE.NULL;

The IFMATCH function is a powerful application of regular expressions and can be used to create very complex code.