Question

I have following string “Class (102) (401)” and “Class (401)” i want to find regex to find substring which always return me value ‘Class’ out of “Class (102) (401)” or “Class (102)”

Following is my code

Pattern MY_PATTERN = Pattern.compile(".^(\\(\\d+\\))");
    Matcher mat = MY_PATTERN.matcher("Class (102) (401)");
    while (mat.find()){
        System.out.println(mat.group());
    }

Answer 1

I don’t see how that might be useful – but if you need it, the ‘class’ will be in the first matching group if you use this regex:

(Class)(?:\s*\(\d+\))+

If you need to capture other words followed by the same pattern just use:

(.*?)(?:\s*\(\d+\))+

If it’s the numbers that you are after rather than the string ‘class’ use this one and the matches will be also in the capturing groups:

Class(?:\s*\(\(d+)\))+

You’ll need to escape the backslashes, I left that out for readability.