Inverting results when searching error logs in App Engine's dashboard?

Is there a way to invert the results when searching error logs in the GAE dashboard? (similar to the grep -v command) 开发者_高级运维For example, I want to be able to filter out paths that start with some string, X.

To filter our requests that start with path /X you could try filtering on the path label:

path:/[^X].*

No you can't, the logs search features in Google App Engine Dashboard are fairly limited.
One common suggestion is to download the logs on your filesystem and parse them using your preferred data crunching tools.