I tried searching the forums for the string /var/log/journal and got lots of threads that I shouldn't have because it must have ignored the slashes and did an "or search" on the individual words. So then I tried the search using quotes, like "/var/log/journal" and I got the message:

You don't have permission to access /search.php on this server.
Some sort of anti-injection code perhaps, that is falsing?

How can I search on a string like /var/log/journal and get relevant results?