Regular expression to block url that contains keyword

Question

Hi, 
 I would like to setup something so that I can block the youtube query where part of it contains specific keyword. 
 I am currently not decrypting https traffic and I don't know how can I do that. Will it be possible to block youtube queries for some keywords since youtube is https. 
 I also would like to know how can I enable decryption of https traffic and what advantage would I get from it. As soon as I enable it, I start getting certificate error for all sites which are https. 
 I added certificate based on instructions provided on one of my computer but, I can't add to my other devices like google home and android phones. I hope, I don't need an actual domain and ssl certificate for it to achieve it. 
 
 Thanks

Andy Johnson · Answer

BAlfson said: 
 It's not Webserver Protection that you want, Andy. Just go to the 'HTTPS CAs' tab in 'Web Protection >> Filtering Options' where you can download and install the Proxy CA. 
 For the IoT devices, assign them fixed IPs and have the Proxy skip those sources. For the phones and tablets, you should be able to install the CA. 
 Cheers - Bob

Thanks Bob, 
 This one did the trick. I created a unique host, regenerated certificate, downloaded it and then installed it on client computers and it work beautifully. 
 Andy