public static List<Integer> getStr(){
        List<Integer> strList=new ArrayList<Integer>();
        String content = "COUNT(<a billid=\"9160150\">A</a>,<a billid=\"9160151\">B</a>,<a billid=\"9160152\">C</a>)" ;
        Pattern p=Pattern.compile("\\d{7}");
        Matcher m=p.matcher(content);
        while(m.find()){
            String tmp=m.group();
            System.out.println(""+tmp);
            Integer i=Integer.parseInt(tmp);
            strList.add(i);
        }

        return  strList;
    }

------解决方案--------------------

for example
Java code
List<String> list = new ArrayList<String>();
String str = "COUNT(<a billid=\"9160150\">A</a>,<a billid=\"9160151\">B</a>,<a billid=\"9160152\">C</a>)" ;
Matcher m=Pattern.compile("(?i)billid=\"(\\d+)\"").matcher(str);
while(m.find()){
    System.out.println(m.group(1));
    list.add(m.group(1));
}
String[] arr = list.toArray(new String[0]);