How do I block using regex in XG?

AFAIK it can't be done with regex, but you can achieve your goal. 
I've just tested it and it works.

Step 1.
Protect > Web > Categories: add a categorie like this:

Step 2.
Protect > Web > User activities: Create a new activity like this:

Step 3.
 Protect > Web > Policies: edit / create a policy ie.:

I've tested this on you're URL: https://en.wikipedia.org/wiki/The_Unconquered_(1940_play)
I can view this page but can't edit it.

Good luck.

Thanks, that would work somewhat, but it would block all the other action types - eg. being able to check the edit history, and any permalinks to a specific version of the page.

So, I wouldn't want to block the following:

https://en.wikipedia.org/w/index.php?title=The_Unconquered_(1940_play)&oldid=940588704

https://en.wikipedia.org/w/index.php?title=The_Unconquered_(1940_play)&action=history

https://en.wikipedia.org/w/index.php?title=The_Unconquered_(1940_play)&action=info

https://en.wikipedia.org/w/index.php?title=Special:CiteThisPage&page=The_Unconquered_%281940_play%29&id=940588704

https://en.wikipedia.org/w/index.php?title=Special:ElectronPdf&page=Groove&action=show-download-screen

https://en.wikipedia.org/w/index.php?title=Groove&printable=yes

But your rule would do that I believe?

Michael Dunn 

can you explain how to use the url categories to block what the user is asking?

Thanks

try this:

Now i can't edit, all the other links keep working though...

try this:

Now i can't edit, all the other links keep working though...