Add regexp support for $domain modifier

[slavaleleka]

now there is no chance to create single cosmetic rule for hiding the same element on such domains:
example1.com, example2.com, example3.org

it would be nice if $domain modifier supports regular expressions, just like $path does

something like this:
[$domain=/example[0-9]\.(com|org)/]##.ad

[ameshkov]

Why limit just to the cosmetic rules? If we do it here, we should extend it to basic rules as well.

@sfionov can we include this in v1.10 for instance?

[sfionov]

Yes, assigned to 1.10

[Alex-302]

Another one example
AdguardTeam/AdguardFilters#121186 (comment)
domains changed every day.