I have defined the following pattern:

<Pattern>Zeitstempel: %date%nKontext: %contextName%nAngeforderte URI: %X

{req.requestURI}

%nQueryString: %X

{req.queryString}

%nNachricht: %msg</Pattern>

It is intended for a SMTPAppender. The outcome is:

Zeitstempel: 2010-11-08 12:49:54,241%PARSER_ERROR_nKontext: michael%PARSER_ERROR_nAngeforderte URI: /michael/start%PARSER_ERROR_nQueryString: %PARSER_ERROR_nNachricht: Login:: ms....

The workaround is either enclose the %n in %() or put a space between. Anyway, this should be fixed or noted in the docs.