HTTP Error 500.52 - URL Rewrite Module Error

Hi,

I am trying to get the grav-admin plugin to work, I'm at the point where I imported the .htaccess file into IIS URL Rewrite successfully. The rules are parsed with no errors, and they are created in IIS:

When I browse to the grav-admin site I am presented with the following error:
HTTP Error 500.52 - URL Rewrite Module Error. The expression "({{|}}|{%|%})" contains a repeat expression (one of '*', '?', '+', '{' in most contexts) that is not preceded by an expression.

It looks like it is something to do with the rules, but I can't make heads or tails of it.
Please help.
Thank you!

That's the exact issue I had while trying to run Grav on Xampp and then on some native Windows software. Spent a day without any luck solving it. Then I just got Laragon (as I already suggested) and there were no issues ;) Doesn't look like I'm going back to Xampp or that Windows solution any time soon

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Thanks, I'm going to need to get Laragon and try all this again sometime.
I am quite despondent with Grav at the moment - I'll hopefully pick it up again in the near future.

Hi, I don't have any experience with Linux unfortunately. I was just trying to play around with Grav to see if it would work for my use case before making any decisions to move to a new OS or web server etc.

I found that if you removed the two sub-rules, it will work. I've been searching online and couldn't find a direct solution for IIS. So, I actually stopped being lazy and read the error and figured it out.