Regex getting special caracter

I have a string like:
 

string s1 = "dog().Cat(\"Happy\")";

 
I want to:
1) count the number of round brackets '(', I expect as result 2
2) get the text inside, I expect "\"Happy"\", which appear in console output as "Happy"
No idea for 1. I try the following for 2
 

string k = Regex.Match(s1,@"\((\w+)\)").Groups[1].Value;

 
But It fails in understanding the \" character
Any Idea?