Remove pages after import of access_log

I have configured a new site in piwik and I successfully imported the apache access_log so I get the stats for the last months. access_log are imported only once. I added the javascript code so future access will be monitored.

But after the import my site contains all the pages of all my apps.
How can I filter or delete the pages I don’t want?
Per example how do I keep only this page http://mydomain/myapp/index.php

thank you

I solved by only keeping the desired lines in access_log before importing.
Please tell me if that is not an appropriate solution