在java中怎么利用正则表达式匹配数字

 private List 
 GetTmpFieldsList(List 
 FieldsList,String tmptableName,String IndexName) { 
 
 List 
 maps = new ArrayList<>();
 for(String field :FieldsList){
  //必须包含传入的标识符，同时要包含数字
  if(field.toLowerCase().contains(tmptableName.toLowerCase())){
  FieldList e = new FieldList();
  String [] fieldArray = field.split("\\.");//带数字的string
  field = field.replaceAll("\\_&#63;\\d+", ""); //去掉下划线加数字 得有效的物理名
  String [] fieldArray2 = field.split("\\."); //不带数字的string
  Pattern p = Pattern.compile("\\d+"); //得到字符串中的数字
  Matcher m = p.matcher(fieldArray[1]);
  if(m.find()){
   int key = Integer.parseInt(m.group());
   e.setCaseValue(key);
   if(StringUtils.isEqual(fieldArray2[1], IndexName)){ //for BAT203
   e.setField("CHECK_POSITION"); //項目物理名
   }else{
   e.setField(fieldArray2[1]); //項目物理名
   }
   e.setFieldName(fieldArray[1]); //項目物理名別名
   maps.add(e);
  }
  /**else{ 只有后面带数字的才可以
   if(StringUtils.isEqual(fieldArray2[1],IndexName)){ //for BAT203
   e.setField("CHECK_POSITION"); //項目物理名
   }else{
   e.setField(fieldArray2[1]);
   }
   e.setFieldName(fieldArray[1]);
   maps.add(e);
  }**/
  }
 }
 //Add ACE商品マスタ.更新フラグ 
 return maps;
 }

/**
 * Created by changle on 17/1/9.
 */
@Slf4j
public class JSONTest {
 public static void main(String[] args) {
 testAtoB();
 //testAtoB() 发生:Can not deserialize instance of com.test.JSONTest$Hobby out of START_ARRAY token
 
 testBtoA();
 //testBtoA() 发生:Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
 }
 
 public static void testAtoB(){
 List<Hobby> hobbies = new ArrayList<>();
 Random random = new Random();
 for(int i=0;i<3;i++){
  Hobby hobby = new Hobby(random.nextInt(),"测试名称","测试类型",random.nextInt(100));
  hobbies.add(hobby);
 }
 StudentA studentA = new StudentA();
 studentA.setAge(23);
 studentA.setFromCity(true);
 studentA.setMoney(3000);
 studentA.setName("张三");
 studentA.setHobbies(hobbies);
 try {
  String str = JSON.json(studentA);
  log.info("str={}",str);
  //list转换单个projo
  StudentB studentB = JsonUtil.jsonObject(str, StudentB.class);
  log.info("studentB.name:{}",studentB.getName());
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
 
 public static void testBtoA(){
 Random random = new Random();
 Hobby hobby = new Hobby(random.nextInt(), "测试名称", "测试类型", random.nextInt(100));
 StudentB studentB2 = new StudentB();
 studentB2.setAge(23);
 studentB2.setFromCity(true);
 studentB2.setMoney(3000);
 studentB2.setName("张三");
 studentB2.setHobbies(hobby);
 String str2 = null;
 try {
  str2 = JSON.json(studentB2);
  //单个projo转换list
  StudentA studentA2 = JsonUtil.jsonObject(str2, StudentA.class);
  log.info("studentB.name:{}", studentA2 == null &#63; "" : studentA2.getName());
 } catch (IOException e) {
  e.printStackTrace();
 }
 }
 
 @Data
 public static class StudentA{
 private String name;
 private int age;
 private long money;
 private boolean isFromCity;
 private List<Hobby> hobbies;
 }
 
 @Data
 public static class StudentB{
 private String name;
 private int age;
 private long money;
 private boolean isFromCity;
 private Hobby hobbies;
 }
 
 @Data
 public static class Hobby{
 private long hId;
 private String hName;
 private String type;
 private int score;
 
 public Hobby(){}
 
 public Hobby(long hId,String hName,String type,int score){
  this.hId = hId;
  this.hName = hName;
  this.type = type;
  this.score = score;
 }
 }
}