java - 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)";

I want to split the string at '(' using regular expression.For that i am using

Arrays.asList(Pattern.compile("/(").split(str))

But i am getting the following exception.

java.util.regex.PatternSyntaxException: Unclosed group near index 2
/(

Escaping '(' doesn't seems to work.

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 -- [(]