java正则表达式

使用正则表达式查找字符串中数字出现的位置：

import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class PrimitiveTypeTest {
    //查找数字，返回位置 
    private static final String regex ="\\d+";
    private static final String input ="0 cat catt catre cat cat 9";
    public static void main(String[] Args) {
        Pattern p =Pattern.compile(regex);
        Matcher q =p.matcher(input);
        int count=0;
        while(q.find()) {
            count++;
            System.out.println("match number"+count);
            System.out.println("start()"+q.start());
            System.out.println("end()"+q.end());
        }
    }
}