Need help with RegEx

[vovahumnytskiy]

UPDATE: solved by “is in” without RegEx

I want to filter RG and show links from LINKS db that has the same URL as a CURRENT list of URLs item that belongs to CATEGORY db.

list of URLs in the Category db looks like a single text, for example: “link1, link2, link3”.
I check whether current LINK’s URL = one of the links in “link1, link2, link3”. So, Bubble does not know that “link1, link2, link3” is 3 different links. Buble thinks that it is a simple text.

So I need RegEx help, I am not good in this technology. Please, help.

P.S. my case is RG (LINKS) inside RG (CATEGORY)