Regular Expression for matching parentheses

Question

What is the regular expression for matching \'(\' in a string?

Following is the scenario :

I have a string

str = \"abc(efg)\";

Answer 1

Two options:

Firstly, you can escape it using a backslash -- \(

Alternatively, since it's a single character, you can put it in a character class, where it doesn't need to be escaped -- [(]