How to replace using regular expressions in sublime text 3?

Question

PHP

The file contains lines like:

font-family: Arial Bold;
font-family: Arial Regular;
font-family: Arial Light;

We need to replace the whole thing with
font-family: Arial ***, sans-serif;
Any connoisseurs?

Answer 1

=> Enable regex
=> Find What: Arial (\w+);
=> Replace With: Arial $1, sans-serif;
=> ReplaceAll

Answer 2

I do it with gulp csscomb

Answer 3

if you need it once, then use notepad ++ better there is a mass replacement.
write what to look for: "Arial Bold", write what to replace with: "font-family: Arial Bold, sans-serif;"
and so on for all three