removing part of uri in redirect

Using Kevin's rule, I put in the logging and it looked like everything that was under the host testsite.com and within the applications part (not just testapp) went through this rule and logged that it tried to send it to testsite.com/applications/testapp/.... This was every application within the /applications folder not just /testapp. I've had to remove the rule since it seems to want to route everything to the same page. I do not want every application within /applications to go to the redirect, only the application called /testapp. Is there some explanation as to why every application tries to follow the redirect?