How do I block using regex in XG?

Question

So, I am trying to block based on a regex, but cannot find anywhere which would accept this. Specifically, I want to block editing on Wikipedia for a group of users - so I have a regex that checks Wikipedia site requests for the action=edit part at the end, but as far as I can tell I can only block based on domain, URL or keyword? 
 Does anyone know how I can do this?

Peter-Paul Gras · Accepted Answer

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.

Peter-Paul Gras · Answer

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

FormerMember · Answer

Hi Peter-Paul Gra, 
 I followed you suggestion and it only blocks this link : https://en.wikipedia.org/w/index.php?title=The_Unconquered_(1940_play)&action=edit

All other links works just fine: 
 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 
 
 So Tony Ayre , if you only wants to block : https://en.wikipedia.org/w/index.php?title=The_Unconquered_(1940_play)&action=edit , follow the steps provided by Peter-Paul Gra. 
 Thanks,