Extracting string from within round brackets in Java with regex

Question

I\'m trying to extract a string from round brackets.
Let\'s say, I have John Doe (123456789) and I want to output the string 123456789 only.

Answer 1

You need to escape brackets in your regexp:

    String in = "John Doe (123456789)";

    Pattern p = Pattern.compile("\\((\\d*)\\)");
    Matcher m = p.matcher(in);

    while (m.find()) {
        System.out.println(m.group(1));
    }