A task on a pure regular expression?

Question

Regular Expressions

wrote an expression for determining links
/(https?:\/\/)?(www\.)?(\w+\.)(\w{2,4})\/?/
Now, it is necessary that all links, except for mysite.loc I
thought to do it through logical AND , but as far as I know, it is not in pure regular expressions. (Or am I wrong?) Help please!
It is possible not on pure regular expressions, but please explain how it works)

Answer 1

/\b(https?:\/\/)?(www\.)?+(?!mysite\.loc)(\w+\.)(\w{2,4})\/?/

https://regex101.com/r/2kbkCh/1