java正则表达式取括号里面的内容

public static String changeCompName(String compName){
            String NewCompName="";

            //cm1230NHL6X7K(2)
            //String tests="cm1230NHL6X7K(2)";
            //compName=tests;      

            boolean twice=false;
            if(compName.indexOf("(")>=) twice=true;
            Pattern p=Pattern.compile("([a-z]+)(\\d+)");
            Matcher m=p.matcher(compName);
            while(m.find()) {
                NewCompName=m.group();
            }

            if(twice){
                Pattern p2=Pattern.compile("(?<=\\()[^\\)]+");
                Matcher m2=p2.matcher(compName);
                while(m2.find()) {
                    NewCompName+="("+m2.group()+")";
                }
            }

            //System.out.println(NewCompName);  //cm1230(2) 

 return NewCompName; }