forward slash in query string causes Error 404
Grav allows taxonomy terms to contain forward slashes.
For example, the AC/DC in:
title: Back in Black
taxonomy:
genre: Rock
artist: AC/DC
---
However, when processing a search query that contains a forward slash, Grav displays an Error 404 page. For example:

Here is the URL of that page on the Grav Blog Skeleton demo site: https://demo.getgrav.org/blog-skeleton/search/query:AC/DC
For comparison, when processing a search query that does not contain a forward slash (but still doesn't match any pages), Grav displays a "found 0 results" page. For example:

Here is the URL of that page on the Grav Blog Skeleton demo site: https://demo.getgrav.org/blog-skeleton/search/query:ACDC
What happens if you do use the urlencode %2F instead of / ?
/search/query:AC%2FDC
@w00fz, here's what the Grav Blog Skeleton demo site shows:

URL shown in screenshot: https://demo.getgrav.org/blog-skeleton/search/query:AC%2FDC
Oh sorry I didn't realize I could test on our demo.
I can see this being an issue because the / is a URI sensitive separator which indicates subpathing, however urlencoding should work.
We'll look into it. Cheers.
Thanks!
P.S. Whoever looks into it may want to keep Issue #71 in mind as well, as it, too, involves the processing of search queries.
I found a way to prevent this from happening with characters like ":" or "/". You need to use real GET parameters. For example, replace "/myurl/page.json/query:search_string" to "/myurl/page.json?query=search_string".
In JS, use the function encodeURIComponent to encode the search_string before.
@w00fz : The problem can be reproduced on https://learn.getgrav.org/. Maybe my solution can solve the problem!