Contains exact match

Feature Requests
#1

Contains and not contains are good but we need also IS and ISNOT to get exact matches.

#2

It's slightly complicated, but you can stack the :not, :contains, and :has selectors to get exactly the match you need. e.g.

p:contains('DOG'):not(:contains('DOGGED'))

will match any para that contains 'DOG' except if those that contains 'DOGGED'.

#3

But if there is multiple DOG*? I want only DOG, not DOGGED, DOGGY, DOGEMON?