Tried that regex but it still doesn’t work. The rest of the file is working.

Tried and the rest of the file works except for that line. I pasted it into my code.

I tried and it doesn't execute that line. The rest of the file still works

I tried || shExpMatch(url.substring(url.length-4) == ".pdf") but got this error

Thanks, I posted the code below. The server is a local black hole that is reachable. I know it works because this || _dnsDomainIs(host, "api.giphy.com") blocks giphy.com I want to block all incoming pdf's to our devices.

Thanks, I posted the code below the server is a black hole. It works ,I tested it by using this || _dnsDomainIs(host, "api.giphy.com") and it blocks giphy. I wanto to block all .pdf's coming into our devices.