C# Regex match anything inside Parentheses

Question

I want to match anything inside parentheses but the result must exclude the parentheses as well.

Examples:
Initialize(P90W)
Brake(45X)

Answer 1

try regex @"\((.*?)\)"

EDIT: Also the result will be group 1 not 0, group 0 should contain the entire regex result, not the first parenthesized value